Imagine this: a million years ago, you, a primate, migrate to other lands with your large primate tribe. You are leaving the shelter of the forest and going into savanna regions. As a hunter, you find food by searching for footprints and animal droppings. One day, in a pile of scat, you find a mushroom growing – a Psilocybe cubensis. You eat it because that's what you do when you find something that looks like food and is readily available. It tastes slightly spongey and is filled with moisture. You continue walking through the grass, and less than an hour later, colors of the natural world surrounding you become more vivid than you've ever seen them. Patterns of fractals and geometric shapes fill the sky. You experience empathy for the first time – the ability to understand and share the feelings of other members of your tribe. And you know that the whole ordeal is the result of consuming those fungi you found on poop.