Time for some more maths objects! This time I wanted to show you the various polyhedra I’ve got around my desk.

• The tetrahedron is made out of a paper plate, following the instructions on the brilliantly kooky wholemovement.
• The sonobe cube is a classic. Mine’s made out of Post-It notes.
• The swirly thing is made out of curler units. Here’s a nice lady explaining how to use them to make a few different polyhedra.
• The classic reference for the Post-It note dodecehadron is James Grime’s video instructions.
• Once you can make a dodecahedron, add some more maths by edge-colouring it. I followed Julia Collins’ 5-colouring. Or if you’re more adventurous and less colourblind, look at George Hart’s colourings page for some really sophisticated patterns.
• I can’t remember how I made the icosahedron. Can anyone remind me?
• Finally, I’ve shown off the enneahedron loads of times. I wrote about its creation a couple of years ago.