Excerpt from Tomorrow, and Tomorrow, and Tomorrow by Gabrielle Zevin, plus links to reviews, author biography & more

He had known that she had gone to MIT and had wondered if he might run into her when he got into Harvard. For two and half years, he had done nothing to force such an occasion. Neither had she.

But there she was: Sadie Green, in the flesh. And to see her almost made him want to cry. It was as if she were a mathematical proof that had eluded him for many years, but all at once, with fresh, well-rested eyes, the proof had a completely obvious solution. There's Sadie, he thought. Yes.

He was about to call her name, but then he didn't. He felt overwhelmed by how much time had passed since he and Sadie had last been alone together. How could a person still be as young as he objectively knew himself to be and have had so much time pass? And why was it suddenly so easy to forget that he despised her? Time, Sam thought, was a mystery. But with a second's reflection, he thought better of such sentiment. Time was mathematically explicable; it was the heart—the part of the brain represented by the heart—that was the mystery.

Sadie finished staring at whatever the crowd was staring at, and now she was walking toward the inbound Red Line train.

Sam called her name, "SADIE!" In addition to the rumble of the incoming train, the station was roaring with the usual humanity. A teenage girl played Penguin Cafe Orchestra on a cello for tips. A man with a clipboard asked passersby if they could spare a moment for Muslim refugees in Srebrenica. Adjacent to Sadie was a stand selling six-dollar fruit shakes. The blender had begun to whir, diffusing the scent of citrus and strawberries through the musty, subterranean air, just as Sam had first called her name. "Sadie Green!" he called out again. Still she didn't hear him. He quickened his pace, as much as he could. When he walked quickly, he counterintuitively felt like a person in a three-legged race.

"Sadie! SADIE!" He felt foolish. "SADIE MIRANDA GREEN! YOU HAVE DIED OF DYSENTERY!"

Finally, she turned. She scanned the crowd slowly and when she spotted Sam, the smile spread over her face like a time-lapse video he had once seen in a high school physics class of a rose in bloom. It was beautiful, Sam thought, and perhaps, he worried, a tad ersatz. She walked over to him, still smiling—one dimple on her right cheek, an almost imperceptibly wider gap between the two middle teeth on the top—and he thought that the crowd seemed to part for her, in a way that the world never moved for him.

"It's my sister who died of dysentery, Sam Masur," Sadie said. "I died of exhaustion, following a snakebite."

"And of not wanting to shoot the bison," Sam said.

"It's wasteful. All that meat just rots."

Sadie threw her arms around him. "Sam Masur! I kept hoping I'd run into you."

"I'm in the directory," Sam said.

"Well, maybe I hoped it would be organic," Sadie said. "And now it is."

"What brings you to Harvard Square?" Sam asked.

"Why, the Magic Eye, of course," she said playfully. She gestured in front of her, toward the advertisement. For the first time, Sam registered the 60-by-40-inch poster that had transformed commuters into a zombie horde.

SEE THE WORLD IN A WHOLE NEW WAY.

THIS CHRISTMAS, THE GIFT EVERYONE WANTS IS THE MAGIC EYE.

The imagery on the poster was a psychedelic pattern in Christmas tones of emerald, ruby, and gold. If you stared at the pattern long enough, your brain would trick itself into seeing a hidden 3D image. It was called an autostereogram, and it was easy to make one if you were a modestly skilled programmer. This? Sam thought. The things people find amusing. He groaned.

"You disapprove?" Sadie said.

"This can be found in any dorm common room on campus."

"Not this particular one, Sam. This one's unique to—"

"Every train station in Boston."

"Maybe the U.S.?" Sadie laughed. "So, Sam, don't you want to see the world with magic eyes?"

Excerpted from Tomorrow, and Tomorrow, and Tomorrow by Gabrielle Zevin. Copyright © 2022 by Gabrielle Zevin. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.