From Pentagons to Pentagrams

https://johncarlosbaez.wordpress.com/2026/05/29/from-pentagons-to-pentagrams/

by surprisetalk • 27 days ago

30 5 27 days ago

johncarlosbaez.wordpress.com

yepyoukno• 26 days ago

Great article on stellated forms! I almost missed it due to the subtle unintuitive title!

fbu• 25 days ago

The Great Dodecahedron is my favorite polyhedron, and it's possible to build one out of paper. Give it a try when you get a chance !

https://www.polyhedra.net/en/model.php?name-en=great-dodecah...

srean• 24 days ago

That makes atleast two of us. Where I live, they festoon a few of these on Christmas in addition to the more traditional five pointed star. I have always wondered whether it had easy enough net.

The Icosahedron though, that makes my heart skip a beat sometimes.

red_trumpet• 25 days ago

The fact that f(L^2) is positive can be seen without inspecting coordinates: after all it is the length of e_i', hence positive.

andybak• 24 days ago

Related work-in-progress if you like polyhedra and tiling transformations: https://ixxyxr.github.io/polyhydra-web/

It has the Kepler-Poinsot polyhedra and allows you to apply a superset of Conway Operators to them. No true stellation currently (stellation isn't an edge-replacement operator so can't be mimicked by Conway-esque operations)

From Pentagons to Pentagrams

Related Stories