To do this puzzle requires some manual work, but it's really worthwhile, I assure you.
Get 20 spheres of styrofoam or something similar, and paste them together, into four pieces, like this:
oooo
oooo
ooo
ooo
ooo
ooo
Each "o" represents a sphere.
Now, try to fit the four pieces together into a pyramid (tetraeder). This is a quite tricky puzzle, although it only has four pieces!
Hilmar.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
