Who is Heraclitus, and what is he whacking, you ask? Heraclitus was an ancient Greek philosopher, widely considered the world's first creativity teacher. The deck has 32 cards, each containing a "whack," or eye-opening exercise based on the epigrams of Heraclitus. They will spur creative thinking and allow you to look at a problem from a fresh perspective. Created by Roger von Oech, author of the best-selling book, A Whack on the Side of the Head and the Creative Whack Pack.