An Immense World
Ed Yong · 2022 · 9 ideas · 9 min
Every animal perceives only a narrow slice of reality shaped by its own senses — its Umwelt — and the natural world is therefore not one shared reality but billions of radically different, overlapping sensory universes.
Why this book
Yong's argument is built around the biological concept of the Umwelt — the specific slice of the world an animal can perceive given its particular senses — and the case that humans chronically underestimate both the sensory richness of other species and the narrowness of our own perceptual window. A tick senses the world through heat and odor with almost no vision at all; an elephant hears and feels rumbles through the ground far below human hearing range; a mantis shrimp's eyes contain photoreceptor types humans can't even conceptually access. None of these animals is missing something we have — each is tuned to a genuinely different reality.
The book matters because it dismantles the casual assumption that human senses represent some neutral, default way of experiencing the world, replacing it with a far stranger and more humbling picture: the natural world is not one shared stage but an overlapping tangle of species-specific sensory universes, most of which humans will never be able to fully imagine, let alone directly perceive.
Who should read it
This rewards anyone curious about animal biology, sensory science, or the philosophy of perception, and works well for readers who enjoyed The Soul of an Octopus or other animal-cognition books. Its chapter structure by sense (smell, vision, hearing, touch, and more exotic senses) makes it easy to read in any order.
About the author
Ed Yong is a British-American science journalist, formerly a staff writer at The Atlantic, whose earlier book I Contain Multitudes covered the microbiome; he won a Pulitzer Prize for his COVID-19 pandemic reporting.