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foldworks<a href="https://mastodon.social/@ark_brut" class="u-url mention" rel="nofollow noopener" target="_blank">@ark_brut</a> A wonky six-strut tensegrity icosahedron. A first attempt that took way longer than expected<a href="https://mathstodon.xyz/tags/tensegrity" class="mention hashtag" rel="nofollow noopener" target="_blank">#tensegrity</a> <a href="https://mathstodon.xyz/tags/icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a> <a href="https://mathstodon.xyz/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#photography</a> <a href="https://mathstodon.xyz/tags/craft" class="mention hashtag" rel="nofollow noopener" target="_blank">#craft</a> <a href="https://mathstodon.xyz/tags/PaperCraft" class="mention hashtag" rel="nofollow noopener" target="_blank">#PaperCraft</a> <a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#geometry</a> <a href="https://mathstodon.xyz/tags/MathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#MathArt</a> <a href="https://mathstodon.xyz/tags/design" class="mention hashtag" rel="nofollow noopener" target="_blank">#design</a>

foldworks<a href="https://mathstodon.xyz/@mrdk" class="u-url mention" rel="nofollow noopener" target="_blank">@mrdk</a> <a href="https://booping.synth.download/@unnick" class="u-url mention" rel="nofollow noopener" target="_blank">@unnick</a> And here’s the rhombic triacontahedron for the dodecahedron/icosahedron (again without scaling the bars to have constant length). <a href="https://mathstodon.xyz/tags/MathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#MathArt</a> <a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#geometry</a> <a href="https://mathstodon.xyz/tags/animation" class="mention hashtag" rel="nofollow noopener" target="_blank">#animation</a> <a href="https://mathstodon.xyz/tags/loop" class="mention hashtag" rel="nofollow noopener" target="_blank">#loop</a> <a href="https://mathstodon.xyz/tags/geogebra" class="mention hashtag" rel="nofollow noopener" target="_blank">#geogebra</a> <a href="https://mathstodon.xyz/tags/dodecahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#dodecahedron</a> <a href="https://mathstodon.xyz/tags/icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a> <a href="https://mathstodon.xyz/tags/3d" class="mention hashtag" rel="nofollow noopener" target="_blank">#3d</a>

foldworksI couldn’t resist making this in Geogebra: morphing between a regular icosahedron and a regular dodecahedron.h/t <a href="https://booping.synth.download/@unnick" class="u-url mention" rel="nofollow noopener" target="_blank">@unnick</a> <a href="https://mathstodon.xyz/@unnick@booping.synth.download/114350750053349050" rel="nofollow noopener" translate="no" target="_blank">https://mathstodon.xyz/@unnick@booping.synth.download/114350750053349050</a><a href="https://mathstodon.xyz/tags/MathArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#MathArt</a> <a href="https://mathstodon.xyz/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#geometry</a> <a href="https://mathstodon.xyz/tags/animation" class="mention hashtag" rel="nofollow noopener" target="_blank">#animation</a> <a href="https://mathstodon.xyz/tags/loop" class="mention hashtag" rel="nofollow noopener" target="_blank">#loop</a> <a href="https://mathstodon.xyz/tags/geogebra" class="mention hashtag" rel="nofollow noopener" target="_blank">#geogebra</a> <a href="https://mathstodon.xyz/tags/icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a> <a href="https://mathstodon.xyz/tags/dodecahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#dodecahedron</a> <a href="https://mathstodon.xyz/tags/polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#polyhedra</a> <a href="https://mathstodon.xyz/tags/3d" class="mention hashtag" rel="nofollow noopener" target="_blank">#3d</a>

ƧƿѦςɛ♏ѦਹѤʞ<a href="https://qoto.org/@barefootstache" class="u-url mention" rel="nofollow noopener" target="_blank">@barefootstache</a> Don't forget to do the knobbly bits in the corners. <a href="https://mastodon.social/tags/icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a> <a href="https://mastodon.social/tags/Roman" class="mention hashtag" rel="nofollow noopener" target="_blank">#Roman</a> <a href="https://mastodon.social/tags/maths" class="mention hashtag" rel="nofollow noopener" target="_blank">#maths</a> <a href="https://mastodon.social/tags/mystery" class="mention hashtag" rel="nofollow noopener" target="_blank">#mystery</a> <a href="https://www.ancient-origins.net/artifacts-other-artifacts-news-unexplained-phenomena/enigma-roman-dodecahedra-002371" rel="nofollow noopener" translate="no" target="_blank">https://www.ancient-origins.net/artifacts-other-artifacts-news-unexplained-phenomena/enigma-roman-dodecahedra-002371</a>

MyBrickZStill a work in progress, but I was inspired by Zachary Steinman's model (<a href="https://pixelfed.social/i/web/post/694621451435536476" rel="nofollow noopener" target="_blank">https://pixelfed.social/i/web/post/694621451435536476</a>), and wanted to build my own. <a href="https://pixelfed.social/discover/tags/Lego?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Lego</a> <a href="https://pixelfed.social/discover/tags/AFOL?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#AFOL</a> <a href="https://pixelfed.social/discover/tags/scuplture?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#scuplture</a> <a href="https://pixelfed.social/discover/tags/geometry?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#geometry</a> <a href="https://pixelfed.social/discover/tags/platonicsolid?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#platonicsolid</a> <a href="https://pixelfed.social/discover/tags/icosahedron?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a>

Andrew CrawfordThe polyhedra I have been making are hollow. I thought I would experiment with putting lights inside of them. I designed a quick triangular key pattern for the latticework.This uses a simple circuit made with a Chibitronics Circuit Sticker, a 1216 coin cell, some copper tape and, some washi tape.<a href="https://mastodon.cloud/tags/LaserCut" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCut</a> <a href="https://mastodon.cloud/tags/LaserCutter" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCutter</a> <a href="https://mastodon.cloud/tags/Polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedra</a> <a href="https://mastodon.cloud/tags/Polyhedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedron</a> <a href="https://mastodon.cloud/tags/Icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Icosahedron</a> <a href="https://mastodon.cloud/tags/CelticArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticArt</a> <a href="https://mastodon.cloud/tags/CelticDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticDesign</a> <a href="https://mastodon.cloud/tags/KeyPattern" class="mention hashtag" rel="nofollow noopener" target="_blank">#KeyPattern</a> <a href="https://mastodon.cloud/tags/PaperElectronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#PaperElectronics</a>

Andrew CrawfordPlease enjoy pondering my icosa-orb.This uses a simple circuit made with a Chibitronics Circuit Sticker, a 1216 coin cell, a reed switch and, a tiny piece of laser-cut plywood.Process video coming soon!<a href="https://mastodon.cloud/tags/LaserCut" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCut</a> <a href="https://mastodon.cloud/tags/LaserCutter" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCutter</a> <a href="https://mastodon.cloud/tags/Polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedra</a> <a href="https://mastodon.cloud/tags/Polyhedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedron</a> <a href="https://mastodon.cloud/tags/Icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Icosahedron</a> <a href="https://mastodon.cloud/tags/CelticArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticArt</a> <a href="https://mastodon.cloud/tags/CelticDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticDesign</a> <a href="https://mastodon.cloud/tags/KeyPattern" class="mention hashtag" rel="nofollow noopener" target="_blank">#KeyPattern</a> <a href="https://mastodon.cloud/tags/PaperElectronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#PaperElectronics</a>

Andrew CrawfordMother of pearl icosahedron for my pearl of a mother on Mother’s Day!<a href="https://mastodon.cloud/tags/LaserCut" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCut</a> <a href="https://mastodon.cloud/tags/LaserCutter" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCutter</a> <a href="https://mastodon.cloud/tags/Polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedra</a> <a href="https://mastodon.cloud/tags/Polyhedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedron</a> <a href="https://mastodon.cloud/tags/Icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Icosahedron</a> <a href="https://mastodon.cloud/tags/MotherOfPearl" class="mention hashtag" rel="nofollow noopener" target="_blank">#MotherOfPearl</a>

Andrew CrawfordCork icosahedron. Displayed here on a zebrawood reliquary. I keep thinking of different materials for the polyhedra.<a href="https://mastodon.cloud/tags/LaserCut" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCut</a> <a href="https://mastodon.cloud/tags/LaserCutter" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCutter</a> <a href="https://mastodon.cloud/tags/Polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedra</a> <a href="https://mastodon.cloud/tags/Polyhedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedron</a> <a href="https://mastodon.cloud/tags/Icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Icosahedron</a> <a href="https://mastodon.cloud/tags/Cork" class="mention hashtag" rel="nofollow noopener" target="_blank">#Cork</a>

MyBrickZWow! Zachary Steinman is at it again. <a href="https://www.instagram.com/steinmanzachary/" rel="nofollow noopener" target="_blank">https://www.instagram.com/steinmanzachary/</a> <a href="https://pixelfed.social/discover/tags/Lego?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#Lego</a> <a href="https://pixelfed.social/discover/tags/AFOL?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#AFOL</a> <a href="https://pixelfed.social/discover/tags/supercool?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#supercool</a> <a href="https://pixelfed.social/discover/tags/icosahedron?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a> <a href="https://pixelfed.social/discover/tags/art?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#art</a> <a href="https://pixelfed.social/discover/tags/sculpture?src=hash" class="u-url hashtag" rel="nofollow noopener" target="_blank">#sculpture</a>

Andrew CrawfordA few seconds of the engraved wooden icosahedron rotating.<a href="https://mastodon.cloud/tags/LaserCut" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCut</a> <a href="https://mastodon.cloud/tags/LaserCutter" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCutter</a> <a href="https://mastodon.cloud/tags/Polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedra</a> <a href="https://mastodon.cloud/tags/Polyhedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedron</a> <a href="https://mastodon.cloud/tags/Icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Icosahedron</a> <a href="https://mastodon.cloud/tags/Celtic" class="mention hashtag" rel="nofollow noopener" target="_blank">#Celtic</a> <a href="https://mastodon.cloud/tags/CelticArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticArt</a> <a href="https://mastodon.cloud/tags/CelticDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticDesign</a> <a href="https://mastodon.cloud/tags/KnotWork" class="mention hashtag" rel="nofollow noopener" target="_blank">#KnotWork</a> <a href="https://mastodon.cloud/tags/CelticKnot" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticKnot</a> <a href="https://mastodon.cloud/tags/DiceGoblin" class="mention hashtag" rel="nofollow noopener" target="_blank">#DiceGoblin</a>

Andrew CrawfordI see a lot of icosahedra with numbers on the faces. I thought I would try engraving one of the wooden ones with those. I didn’t want it to be too plain. So, I made some knotwork to go around the numbers.<a href="https://mastodon.cloud/tags/LaserCut" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCut</a> <a href="https://mastodon.cloud/tags/LaserCutter" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCutter</a> <a href="https://mastodon.cloud/tags/Polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedra</a> <a href="https://mastodon.cloud/tags/Polyhedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedron</a> <a href="https://mastodon.cloud/tags/Icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Icosahedron</a> <a href="https://mastodon.cloud/tags/Celtic" class="mention hashtag" rel="nofollow noopener" target="_blank">#Celtic</a> <a href="https://mastodon.cloud/tags/CelticArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticArt</a> <a href="https://mastodon.cloud/tags/CelticDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticDesign</a> <a href="https://mastodon.cloud/tags/KnotWork" class="mention hashtag" rel="nofollow noopener" target="_blank">#KnotWork</a> <a href="https://mastodon.cloud/tags/CelticKnot" class="mention hashtag" rel="nofollow noopener" target="_blank">#CelticKnot</a> <a href="https://mastodon.cloud/tags/DiceGoblin" class="mention hashtag" rel="nofollow noopener" target="_blank">#DiceGoblin</a>

Andrew CrawfordA quick orbit around the icosahedron.<a href="https://mastodon.cloud/tags/LaserCut" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCut</a> <a href="https://mastodon.cloud/tags/LaserCutter" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCutter</a> <a href="https://mastodon.cloud/tags/Polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedra</a> <a href="https://mastodon.cloud/tags/Polyhedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedron</a> <a href="https://mastodon.cloud/tags/Icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Icosahedron</a>

Andrew CrawfordIt seems like people like icosahedra for some reason. I made an icosahedron with wood panels using the new technique. This is about 6cm (2.25 inches).<a href="https://mastodon.cloud/tags/LaserCut" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCut</a> <a href="https://mastodon.cloud/tags/LaserCutter" class="mention hashtag" rel="nofollow noopener" target="_blank">#LaserCutter</a> <a href="https://mastodon.cloud/tags/Polyhedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedra</a> <a href="https://mastodon.cloud/tags/Polyhedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Polyhedron</a> <a href="https://mastodon.cloud/tags/Icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Icosahedron</a>

Fractal KittyDay 22 - Movablehow rigid we areis infinitesimallymovable — a flexon codepen: <a href="https://codepen.io/fractalkitty/pen/NWoWOQq/0bc5fe606b4eadd565e1dd6782cf30f0?editors=0010" rel="nofollow noopener" translate="no" target="_blank">https://codepen.io/fractalkitty/pen/NWoWOQq/0bc5fe606b4eadd565e1dd6782cf30f0?editors=0010</a>I learned to use p5.geometry and got code for making model work here: <a href="https://www.paulwheeler.us/articles/custom-3d-geometry-in-p5js/" rel="nofollow noopener" translate="no" target="_blank">https://www.paulwheeler.us/articles/custom-3d-geometry-in-p5js/</a>Jessen's icosahedron was created by using vertices in this file: <a href="https://commons.wikimedia.org/wiki/File:Jessen_icosahedron.stl" rel="nofollow noopener" translate="no" target="_blank">https://commons.wikimedia.org/wiki/File:Jessen_icosahedron.stl</a><a href="https://mathstodon.xyz/tags/mathober2023" class="mention hashtag" rel="nofollow noopener" target="_blank">#mathober2023</a> <a href="https://mathstodon.xyz/tags/movable" class="mention hashtag" rel="nofollow noopener" target="_blank">#movable</a> <a href="https://mathstodon.xyz/tags/jessen" class="mention hashtag" rel="nofollow noopener" target="_blank">#jessen</a> <a href="https://mathstodon.xyz/tags/icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a>

Andres<a href="https://youtube.com/watch?v=5HVK55hEtjk&si=-Iov-UeMUAmQaKAx" rel="nofollow noopener" target="_blank">https://youtube.com/watch?v=5HVK55hEtjk&si=-Iov-UeMUAmQaKAx</a><a href="https://stay.woke.institute/tags/d20" class="mention hashtag" rel="nofollow noopener" target="_blank">#d20</a> <a href="https://stay.woke.institute/tags/amethyst" class="mention hashtag" rel="nofollow noopener" target="_blank">#amethyst</a> <a href="https://stay.woke.institute/tags/lapidary" class="mention hashtag" rel="nofollow noopener" target="_blank">#lapidary</a> <a href="https://stay.woke.institute/tags/stunning" class="mention hashtag" rel="nofollow noopener" target="_blank">#stunning</a> <a href="https://stay.woke.institute/tags/icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a>

Spinner<a href="https://dice.camp/@sudnadja" class="u-url mention" rel="nofollow noopener" target="_blank">@sudnadja</a> We had a thread at Matrix Games, about 15 years ago, while they were porting World in Flames. The topic was spherical projections.I contributed by covering Fuller's Dymaxion map with hexes at 100 miles (160 km) per hex. It keeps all the land masses intact, no breaks, with minimal distortion, basically a contiguous map of the Earth.Of course, Fuller would have vehemently opposed using his map for a wargame.<a href="https://dice.camp/tags/Icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#Icosahedron</a> <a href="https://dice.camp/tags/WiFCE" class="mention hashtag" rel="nofollow noopener" target="_blank">#WiFCE</a> <a href="https://dice.camp/tags/Fuller" class="mention hashtag" rel="nofollow noopener" target="_blank">#Fuller</a> <a href="https://dice.camp/tags/MatrixGames" class="mention hashtag" rel="nofollow noopener" target="_blank">#MatrixGames</a>

numbakrunch<a href="https://mastodon.social/@coreyspowell" class="u-url mention" rel="nofollow noopener" target="_blank">@coreyspowell</a> The Platonic solids were all understood by Greeks many centuries before this. Nothing mysterious here. <a href="https://mastodon.online/tags/icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a> <a href="https://mastodon.online/tags/dodecahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#dodecahedron</a>

Mark Gardner<a href="https://social.sdf.org/tags/Dymaxion" class="mention hashtag" rel="nofollow noopener" target="_blank">#Dymaxion</a> <a href="https://social.sdf.org/tags/Folding" class="mention hashtag" rel="nofollow noopener" target="_blank">#Folding</a> <a href="https://social.sdf.org/tags/Globe" class="mention hashtag" rel="nofollow noopener" target="_blank">#Globe</a> from <a href="https://social.sdf.org/tags/Areaware" class="mention hashtag" rel="nofollow noopener" target="_blank">#Areaware</a>, before and after<a href="https://www.areaware.com/products/dymaxion-folding-globe?variant=21946826244" rel="nofollow noopener" target="_blank">https://www.areaware.com/products/dymaxion-folding-globe?variant=21946826244</a> (also available in black and white)The story behind the <a href="https://social.sdf.org/tags/design" class="mention hashtag" rel="nofollow noopener" target="_blank">#design</a>: <a href="https://www.ravenhillstudio.com/story/dymaxion-globe" rel="nofollow noopener" target="_blank">https://www.ravenhillstudio.com/story/dymaxion-globe</a><a href="https://social.sdf.org/tags/BuckminsterFuller" class="mention hashtag" rel="nofollow noopener" target="_blank">#BuckminsterFuller</a> <a href="https://social.sdf.org/tags/Bucky" class="mention hashtag" rel="nofollow noopener" target="_blank">#Bucky</a> <a href="https://social.sdf.org/tags/ShojiSadao" class="mention hashtag" rel="nofollow noopener" target="_blank">#ShojiSadao</a> <a href="https://social.sdf.org/tags/BrendanRavenhill" class="mention hashtag" rel="nofollow noopener" target="_blank">#BrendanRavenhill</a> <a href="https://social.sdf.org/tags/DymaxionProjection" class="mention hashtag" rel="nofollow noopener" target="_blank">#DymaxionProjection</a> <a href="https://social.sdf.org/tags/RaleighProjection" class="mention hashtag" rel="nofollow noopener" target="_blank">#RaleighProjection</a> <a href="https://social.sdf.org/tags/map" class="mention hashtag" rel="nofollow noopener" target="_blank">#map</a> <a href="https://social.sdf.org/tags/cartography" class="mention hashtag" rel="nofollow noopener" target="_blank">#cartography</a> <a href="https://social.sdf.org/tags/Earth" class="mention hashtag" rel="nofollow noopener" target="_blank">#Earth</a> <a href="https://social.sdf.org/tags/planet" class="mention hashtag" rel="nofollow noopener" target="_blank">#planet</a> <a href="https://social.sdf.org/tags/foldaform" class="mention hashtag" rel="nofollow noopener" target="_blank">#foldaform</a> <a href="https://social.sdf.org/tags/icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a> <a href="https://social.sdf.org/tags/polyhedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#polyhedron</a> <a href="https://social.sdf.org/tags/geometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#geometry</a> <a href="https://social.sdf.org/tags/geodesic" class="mention hashtag" rel="nofollow noopener" target="_blank">#geodesic</a>

R. Sunder-RajFor those of you who have regular tetrahedra-packing on your minds because of <a href="https://mathstodon.xyz/@johncarlosbaez" class="u-url mention" rel="nofollow noopener" target="_blank">@johncarlosbaez</a>’s post (<a href="https://mathstodon.xyz/@johncarlosbaez/109739769180023737" rel="nofollow noopener" target="_blank">https://mathstodon.xyz/@johncarlosbaez/109739769180023737</a>), here is a reminder of how irritated I am that a regular <a href="https://mathstodon.xyz/tags/icosahedron" class="mention hashtag" rel="nofollow noopener" target="_blank">#icosahedron</a> cannot be constructed from 20 regular <a href="https://mathstodon.xyz/tags/tetrahedra" class="mention hashtag" rel="nofollow noopener" target="_blank">#tetrahedra</a>.For some reason, I occasionally feel the need to mention that again…and again…😁.

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