I'm going to try to toot a daily .
Here's an itsphun tetrahedron.
mathstodon.xyz/media/ONecVjhgv

You don't need specially-made pieces to construct plastic polyhedra!
David Glickenstein explains how to make polyhedra using PVC pipes and standard fittings: read.somethingorotherwhatever.

A Mastodon instance for maths people. The kind of people who make $\pi z^2 \times a$ jokes.

Use $ and $ for inline LaTeX, and $ and $ for display mode.