An earlier post explained why round pizzas come in square boxes. An astute loyal reader asked why pizzas aren't square. Given that there are square pizzas, we can excuse his ignorance because he doesn't get out much, and we acknowledge that he raises a great point. Here's the answer: Pizza is round because it's the easiest way to spread out a ball of dough into a sheet of consistent thickness. And when you twirl it and throw it in the air, it doesn't get square.