Cardboard Icosahedron with Interlocking Tabs

[rbtdanforth]

You could make this by inny or outie:

Long ago and far away I had window glass scraps

Many years ago I was making slumped glass plates and bowls and as the plates were round and the material was square I had a lot of scraps just sitting there and a more or less boredom waiting for the glass to bend so I made my own Dodecahedron-ish lamp that I recently bumped into again and thought I would share . I had started to point the pentagons out but they were close/far enough out to look more like a mistake than an even sphere or decently pointed star, so I pointed them in to be more dia…