1. The Void

The October rain didn't just fall that evening; it hammered. It struck the dark panes of Hall 303 in the Shenkar Physics building like thousands of small, freezing, desperate fingers trying to get in. It was Tuesday, seven minutes past eight in the evening, and the university was almost entirely empty. The long, polished corridors, usually buzzing with rushing students and the noise of coffee machines, stood silent, bathed in a sickly, yellowish fluorescent light.

We were the remnants. A small group of seven students enrolled in an elective course with the vague title "Paradoxes in Time and Complex Systems". None of us truly understood the syllabus, but the rumors about Professor Eliyahu Shalom were strong enough to draw us in. They said he was a genius who had lost his way. They said he had cracked something that was forbidden to crack. But this evening, his chair was empty.

That was the first sign that something was off-balance. In the three years I've studied here, Professor Shalom had never been late. He was a man who lived by the atomic clock; precision was his religion, and entropy was the enemy. He usually entered the class at exactly 19:55, erased the board with measured strokes, and arranged his papers in a perfect symmetrical pile, parallel to the edge of the desk. But tonight, the board remained smeared with the chemical equations of the previous lecturer, and the podium stood orphaned. Grains of dust danced in the beam of the projector that was left on for no reason, illuminating a blank blue screen.

"He's not coming," Avi said. He sat one row ahead of me, leaning back in the uncomfortable plastic chair, twirling a silver metal pen between his fingers. The click-clack of the pen was the only sound in the room besides the monotonous drumming of the rain. "Waste of our time. Let's cut."

Michal, sitting in the darkest corner of the hall, looked up from her laptop. The bluish light of the screen reflected in her glasses, hiding her eyes, but her voice was sharp. "He will come, Avi. He's just... delayed."

"Delayed?" Avi scoffed, but the smile didn't reach his eyes. He was nervous. We all were. There was a feeling of static electricity in the air, as if a storm was about to break inside the room, not outside. "Did you hear what happened on floor minus one two hours ago?"

No one answered. Avi continued, lowering his voice to a dramatic whisper. "The quantum lab servers. They say there was a voltage drop that burned three processors. But the technician said it wasn't a short circuit. He said the processors just... reset. As if someone physically erased their memory."

I wanted to tell Avi he watches too many sci-fi movies, that the real world is much more boring, and that Professor Shalom was probably just stuck in traffic on the Ayalon Highway in this rain. I opened my mouth to speak, but then the door opened. No, it didn't open – it was slammed against the wall.

2. The Entrance

Professor Shalom stood in the doorway. For a moment, I didn't recognize him. The man who always wore crisp, tailored suits now looked like the survivor of a natural disaster. His gray coat was soaked, dripping a dark puddle that was expanding on the light linoleum. His gray hair, usually combed back neatly, was disheveled and plastered to his forehead with cold sweat. His bag hung haphazardly over his shoulder, half-open, papers peeking out as if they'd been shoved in a hurry.

But the eyes... those were the eyes that frightened me. They darted around the room, scanning every corner, every window, every shadow, as if he hadn't entered a classroom to teach, but was looking for a bunker to hide in. He stepped inside and slammed the door behind him. The key turned in the lock with a sharp metallic clack. We were locked in.

"Good evening?" I tried to ask. My voice came out hesitant, swallowed by the space of the room.

He didn't answer. He limped toward the board, completely ignoring us. He grabbed the eraser and wiped away the chemical equations with violent, broad strokes, leaving a wet trail on the green board. Then he took a piece of white chalk. His hand was shaking so much that the chalk snapped with a loud crack the moment it touched the surface. A small piece flew to the floor. He didn't stop. With the broken piece left in his hand, he wrote three large, crooked, and screeching letters:

He stood there for a moment, his back to us, his shoulders rising and falling with heavy breaths. Then he turned around. "Forget what you knew," he said. His voice was hoarse, low, as if he hadn't spoken for days. "Forget Newton. Forget the second law of thermodynamics. Forget Einstein."

He approached the first row, leaning with both hands on Avi's desk. Avi recoiled, the pen slipping from his hand and rolling onto the floor. "They taught you that time is a river," the Professor whispered, and a strong scent of rain, dampness, and fear emanated from him. "That it flows from one place – the past, to another place – the future. That you cannot step into the same river twice. A lie. It's all a lie."

He straightened up and pointed to the letters on the board. "Time is not a river, ladies and gentlemen. Time is a wave. And what happens to a wave when it hits an opaque wall?"

He turned to us. "Forget what you knew," he said, his voice hoarse. "They taught you that time is a river flowing forward. A lie. Time is a spiral repeating itself."

He approached the first row, leaning with both hands on Avi's desk. "And now, we are going to see if this pulse is still beating."

He looked at me. I felt he was waiting for an answer. "Does it... bounce back?" I stammered. "Does it reflect?"

"Exactly," the Professor smiled, but it was a broken smile. "It reflects.

Reflexive Time Model.
Our reality is not a one-time projection. It is an echo. It is an endless repetition of data colliding with the wall of reality and bouncing back to us."

3. The Experiment

He returned to the lecturer's desk and pulled a small black box out of his wet bag. A red light blinked on it at an irregular rhythm, like the pulse of a dying animal.

"We are going to conduct an experiment," he announced. "We are going to prove that the future has already happened, and that what we experience as the 'present' is merely the system's memory trying to correct itself."

"I need numbers," he commanded. "Don't think. Just throw them out. The system needs random input."

Silence fell over the classroom. I looked at Michal. Her face was pale.

"Come on!" he shouted, and the lights in the classroom flickered. "Give me data!"

"  24," Avi blurted out. "Today's date."
"  1985," Michal said. Her birth date.

I felt a pressure in my chest. "Seven," I said. Just a number.

The Professor typed the last digit. His finger hovered, trembling over the ENTER key. He pressed it.

The box emitted a harsh buzzing sound. The large screen on the wall flickered. And then, everything stopped. The screen was painted in bright green. One number appeared on it. Large. Stable. Impossible.

"This makes no sense. The probability is one in a billion," Michal whispered.

"Probability is dead," the Professor said. "The cycle has closed."