The Hallway That Wasn't There

The hallway was empty except for the two of them and forty feet of wet paint.

The art teacher, Mr. Okafor, had gone to wash brushes twenty minutes ago and said back in five, which Maya had learned meant something closer to never. So they kept painting the mural. Trees, mostly. A river that was supposed to look like it went off into the distance.

"Your river is broken," Maya said.

"It is not."

"It bends the wrong way at the end." She pointed with a dripping brush. "From here it looks like it goes uphill."

Soren walked down to the far end and looked back. He came halfway. He stopped.

"Come stand where I am," he said.

She did. From the middle of the hallway the river ran flat and true.

"It changed," Maya said.

"It didn't change. We moved."

They traded places three times, just to be sure, the paint smell thick and the lights humming. The river bent uphill from the door and ran flat from the middle and looked, from the far end, like it poured straight down.

"Okay," Maya said. "So which one is the real river?"

Soren didn't answer right away. He took out his notebook and drew three small arrows, one for each spot they'd stood.

"They're all the same paint," he said. "We're the thing that's different."

Maya squinted at the far end. Then she did something she'd been doing without noticing all night. She filled in the part of the mural that wasn't painted yet. There was a gap, about two feet, where they'd run out of green. In the gap her eyes kept putting trees. Not really. But sort of.

"Hey," she said. "Cover your left eye."

"Why?"

"Just do it. Look at the gap."

They both stood with one eye covered, staring at the unpainted wall.

"The wall keeps trying to be trees," Soren said slowly.

"For me too."

He lowered his hand. "There's a spot in your eye where the nerve goes out the back. No light gets caught there. There's a hole in everything you see and you never notice it because your brain fills it in."

"With what?"

"With a guess. Whatever's around the hole, it just keeps the pattern going."

Maya looked at the green trees, then at the gap that was secretly trees, then at Soren.

"So part of what I'm looking at right now," she said, "isn't coming from the wall. It's coming from me."

"From your trees. The ones you already painted. Your brain knows what's supposed to be there, so it puts it there."

Maya went quiet. Then she said, "How much."

"How much what."

"How much of it is me filling in and how much is actually the wall."

Soren opened his mouth to say a little. He stopped, because he wasn't sure that was true, and he didn't like saying things he wasn't sure of.

They looked at the mural together. The river that wouldn't hold still. The gap that grew trees. The way the far end fell downhill the second you stood at the door.

"Try this," Maya said. She was already walking to the light switch. "I'm going to turn it off for one second."

She flicked it. For a moment the hallway was dark, and then it wasn't, and Maya said, "What did you see in the dark?"

"The mural," Soren said. "For like half a second. The trees were still there."

"In the dark."

They both stood very still.

"That's not the wall," Maya said. "There's no light. The wall can't send anything in the dark. That was just my brain still showing me the trees it expected."

Soren wrote it down with his hand shaking a little, the pen scratching loud in the quiet hallway. He wrote: eyes closed, trees still there. He underlined trees.

"So here's the part I can't get out of my head," he said. "When the lights are on. When we're both looking right at it. How is that different? My brain is doing the same thing. It's showing me what it expects. The wall is just, like, correcting it."

"Correcting," Maya repeated.

"The light comes in and says no, not quite, the river's over here. And my brain goes, oh, okay, fixes its guess. But it always starts with the guess." He looked up. "I don't ever just see the wall. I see my guess about the wall, with the wall's corrections painted on top."

Maya stared down the long hallway. The river ran flat from where she stood. She knew, now, that if she walked ten steps it would tilt, and that the tilt was hers, that she was carrying the tilt around inside her head and laying it on the paint.

"Then there's no spot," she said. "There's no place I can stand where I just see the actual river. There isn't one. Every spot is a different guess."

"Right."

"Even when I think I'm just looking."

"Especially then."

They heard Mr. Okafor's footsteps far off, the clatter of clean brushes in a tin. Neither of them turned around.

"So everybody in this whole school," Maya said, "everybody in the whole world, is walking around inside their own guess. And they correct it just enough not to bump into things. And they think they're seeing the room."

"They are seeing the room," Soren said. "They're just also making most of it."

Maya laughed, but it came out small. She covered her left eye again. The gap in the mural grew its phantom trees, patient and green, exactly where she expected them.

"Soren," she said. "How would I even know if I was wrong about something? If my eyes just fill it in to match what I already think?"

He didn't have that one. He wrote the question down instead, the pen moving slow.

Then he reached out and, very deliberately, painted one real tree into the empty gap, so that for at least two feet of one hallway, the guess and the wall would finally say the same thing.