“Every human being is a colony,” Pablo Picasso once said. The insight is made literal in Ed Yong’s acclaimed book, I Contain Multitudes, about our hidden relationship with the microbial world. “If we zoomed in on our skin,” he writes, “we would see them: spherical beads, sausage-like rods, and comma-shaped beans, each just a few millionths of a meter across. They are so small that, despite their numbers, they collectively weigh just a few pounds in total. A dozen or more would line up cosily in the width of a human hair. A million could dance on the head of a pin.”
These microbes are not just hitching a ride, but enabling us to become ourselves: they help digest our food, sculpt our organs, and craft and calibrate our immune systems. To be at all, Yong demonstrates, is to be in partnership with them. Yong’s work has contributed to a radical shift in how we understand animals — from discrete organisms motivated by competition to living islands, communities of hidden beings.
