The Shape of Things Unseen summary

Imagine a table with five objects on it: a wristwatch, a pear, a key, a spoon, and a used train ticket. Now, imagine a white cloth covering those objects. You are asked to recall the objects that are now hidden. Easy: a wristwatch, a pear, a key, a spoon, and a used train ticket. But how did you recall them? Did you memorize the list of objects verbally? Or did you visualize them in your mind's eye?

Visualization takes center stage in our imagination. There's a reason, after all, that the word imagination has its roots in the Latin word imago, or image. This imaging can be both voluntary – for example, when I ask you to imagine a puppy and your brain helpfully supplies an image of a cute little dog – and involuntary, as with hypnagogic imagery, those wild visualizations that drift into our heads as we're between wakefulness and sleep. Usually, imagination involves a mixture between the two: we voluntarily follow a train of thought, but can't always control where our mind wanders.

I’ve got a riddle for you. What single word links pine, sauce, and tree? Now you might get the answer straight away, but more likely your process will look like this: a mixture of methodical reasoning and creative leaps.

These creative leaps lie behind what we’re going to call productive imagination, the creative ‘spark’ that enables innovation. Throughout history, these ‘sparks’ have revolutionized our understanding of the world. One evening in the 1880s, Belgian chemist Friedrich Kekule was dozing by the fire. He had spent the day trying to work out the structure of the chemical component benzene. Now, drifting to sleep, he dreamed of atoms dancing around like snakes. One snake was eating its own tail. On waking, Kekule immediately realized that benzene was structured like a ring. Or, if you prefer, like a snake eating its tail.

Meet Maria. She’s very young. So young, in fact, that she’s yet to be born. But already, the embryonic beginnings of her imaginative capacity are beginning to take shape.

She begins life as a cluster of cells. By her third week in utero, Maria's ectoderm has formed. This is the critical outer embryonic layer that gives rise to her nervous system. At 42 days, some of her cells have begun differentiating into information-transmitting neurons that establish synaptic connections with their neighboring cells. Gradually these synaptic junctions will adapt for specific functions from sensory processing to higher cognition. 

Imagine returning home to find your loved one replaced by an identical imposter. Someone who looks and behaves exactly like them, yet somehow isn't them. It’s the stuff of science fiction. Unless you suffer from Capgras delusion. Then it is your lived reality.

What is a delusion? In essence, it’s imagination gone awry. Delusions are fixed, false beliefs that remain resistant to contrary evidence and exist in a disconnect from their sufferer’s social and cultural context. Where delusions take hold, the boundary between the real and the imaginary is dissolved, creating a troubling new landscape of perception.

You’ve heard of the placebo effect, right? It’s one of the most fascinating phenomena in medicine: patients experience real physiological improvements simply because they believe they're receiving treatment. Our imagination can literally alter our physical reality and reduce pain. Yet this is merely the beginning of imagination's transformative potential.

Take music. More specifically, take the trombone. Studies of trombonists have shown that when they mentally rehearse their pieces, vividly imagining the movements, sounds, and sensations of playing, they significantly improve their actual performance. What’s more, combining physical practice with mental rehearsal produces superior results compared to physical practice alone.