> In another devious brainteaser, Martin displayed the following dissection of a triamond into four congruent convex pieces and asked for a dissection of a square using five congruent convex pieces.

> The answer, in hindsight, is blindingly obvious—did we mention that Martin was also an ace magician, and hence a master of misdirection?

I really want to know the answer, but Google isn't being helpful.