The Proof Is In The Pudding Bowls - Set of Four - Ceramic A set of four ceramic pudding bowls with the proofs to classic theorems of Euclid, Hippasus, Pythagoras, and Gauss. Terrific gift for mathematicians, scientists, students, or any geek on your gift list. We are not going to lie to you: this one is for the mathematikoi - the inner circle of the school of Pythagoras. If you think all math is rational, you are living in a fool's paradise. These bowls are dangerous - so dangerous that one theorem just might have culminated in murder. (Look it up - Hippasus of Metapontum sleeps with the fishes because he couldn't keep his mouth shut about the square root of 2). Each bowl is 8 oz., 4? diameter, 2? tall - yet so deep! Comes in a fun gift box. Click on "The Unemployed Philosophers Guild" near the product title to see more great gifts. UPG truly has presents of mind.