The Map Made of Hands

The waiting bench in the rehab gym was too short for Maya's legs and too far from anything interesting, so she read the wall.

The wall had a poster of a man. Not a normal man. The man on the poster was built wrong on purpose. His hands were enormous, each finger thick as a loaf of bread. His lips bulged out past his chin. His face swallowed most of his head. But his back and his belly and his thighs were shrunk down to almost nothing, like someone had let the air out of them.

Across the top it said CORTICAL HOMUNCULUS. Underneath, smaller: the body drawn in proportion to the brain space that senses it.

Maya read that twice.

Then she looked over at her brother Dev, who was sitting at a table squeezing a soft blue ball with his hurt wrist while a therapist counted. Dev was sixteen and mostly annoyed at everything now, especially at his wrist, which had stopped doing what he told it to.

"Five more," the therapist said. Her name tag said Priya. She had a coffee going cold beside her and she was watching Dev's fingers, not his face, the whole time.

Maya went back to the man on the wall. She held up her own hand in front of it, comparing. Her actual hand was small. On the poster the hand was a monster.

She thought about what that meant, if it was drawn to match brain space. It meant the part of her brain that felt her hand was huge. Bigger than the part that felt her whole back. She reached behind herself and pressed a finger into her own spine, between her shoulder blades, and tried to feel exactly where she was touching.

She couldn't. Not exactly. It was a blurry there-somewhere feeling.

Then she touched her fingertip to her thumb, the lightest tap, and she knew precisely where. To the millimeter. Two places on the same body, and one of them was practically a fog.

"Priya," Maya said. "Can I ask you something."

The therapist looked up. "Sure."

"The man on the wall. His hands are giant because that's how much brain there is for hands?"

"That's the idea," Priya said. "Sensory and motor cortex. Your hands get a huge slice. Your back gets almost nothing." She turned back to Dev. "Three more, come on."

Maya kept looking at the giant hands. Something did not sit right, and she followed it the way she followed everything, past the point where a politer person would have stopped.

If her brain spent that much room on her hands, it wasn't spending it for no reason. You did not build a huge room in a small house unless you were going to live in it.

"Test me," Maya said to Dev. "With something."

"I'm busy," Dev said.

"You're squeezing a ball."

He rolled his eyes, but he was bored too. He picked up a paper clip off the table and closed his good hand around it. "Behind your back. I'll put stuff in your hand. Guess it without looking."

Maya turned around and put her hands behind her. Dev dropped things into her palm one at a time. Paper clip. A coin. A crumpled sticky note. A rubber band. She got every single one before her fingers had even finished closing. She wasn't guessing. She was reading them, the way you read a word without sounding it out.

Then she said, "Okay. Now put them on my back."

"On your back?"

"Between my shoulders. Same things. I won't look."

Dev pressed the coin flat against her spine.

"Coin," she said, easily, because she'd heard it clink.

"No hints." He warmed the rubber band in his fist first so it wasn't cold, and laid it on her back without a sound.

"Something," Maya said. "Something soft? Or thin. I don't know. It's just pressure." She frowned at the wall. "Try the paper clip."

He laid the paper clip on her back. Then the sticky note. Then the coin again. Maya, who had named every object in her hand instantly, could not tell them apart on her own back. They were all just weight and warmth in a place she couldn't quite point to.

She turned around. Priya had stopped counting and was watching now, coffee forgotten.

"Same skin," Maya said. "Same me. My hand knew everything. My back knew almost nothing."

"Right," Priya said slowly. "Because"

"Because the map isn't the body," Maya said. "The map is how much you use it." She held her own hand up again, next to the monstrous hand on the poster, and this time it didn't look like the poster was exaggerating. It looked like the poster was telling the truth and her regular-sized hand was the lie. "That's not a picture of a man. That's a picture of what it feels like to be a person from the inside. If you drew me the way my brain feels me, I'd have giant hands and a giant mouth and a back like a piece of paper."

Dev had stopped squeezing the ball. He was staring at his own hurt wrist, opening and closing the fingers.

"That's why this takes so long," he said. "Isn't it. There's this much brain" he spread his good hand wide "in charge of this much wrist."

"Yes," Priya said, and for the first time she sounded surprised at her own patients. "That's exactly why. There's so much of you dedicated to your hand that when it stops working, there's an enormous amount to wake back up."

Maya looked from Dev's slow fingers to the poster to her own hands, and the room felt suddenly crowded, as if everyone in it were secretly the shape of the man on the wall, all of them walking around with invisible giant hands, giant lips, and small quiet backs they could barely feel.

She picked up the blue therapy ball off the table.

She closed her eyes and squeezed it, slowly, feeling the exact dimple where each fingertip pressed in, all ten of them reporting at once, loud and clear and specific, a whole crowded city of nerve talking to a whole huge district of brain built just for this.

Dev reached out with his good hand and took the ball back, and started his own count out loud, without being told.