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."

1. The Vacuum

The first thing that disappeared wasn't the light, but the sense of space. In an instant, the walls of Hall 303 seemed to collapse inward and cling to us, or alternatively – recede to infinity. In the darkness that fell upon us, the concepts of "near" and "far" lost all meaning.

I should have been ready for this. After all, I saw the number 1985 flashing, felt the floor shaking beneath my feet seconds earlier. But nothing really prepares you for the moment civilization turns off. It wasn't just the darkness of a stairwell when a lightbulb burns out. It was an active darkness. A dense, heavy, viscous substance that poured into the room and filled every crack, entering my ears, nose, and mouth, choking the scream in my throat.

For a split second that felt like an eternity, the only thing I heard was the ringing silence in my ears after a power outage, and my own heart, pounding against my ribs with physical force, like a fist trying to break out of my chest.

And then, the smell arrived. It crawled toward us from the disabled ventilation systems. It started as a slight, bothersome tingling at the tip of the nose. A sharp, metallic, "electric" smell. The smell of burnt ozone, like the air left after a too-close lightning storm. Mixed into this smell was something else, more earthy, nauseating – the smell of cheap plastic melting at high heat, and maybe... maybe the sour smell of cold sweat. The smell of our own fear.

I tried to find an anchor point. I raised my hand in front of my face. I saw nothing. Not even a silhouette. My eyes strained to open wide, my pupils desperately searching for a single photon of light, but the void was absolute. I felt dizzy, as if the floor had dropped away and I was floating in space. "Breathe," I commanded myself mentally, but the air suddenly felt thin, as if the oxygen had been sucked out along with the light.

But then, out of this black sea, it appeared. In the center of the void, on what used to be the massive oak lecturer's desk, one red dot refused to die. The black box. It hadn't turned off. On the contrary. In the absolute darkness, the number 1985 glowed on it with an intensity that wasn't there before. It was no longer just a digital display of a clock or a measuring device. It was alive. It burned bright red, steady, sinister. It didn't blink. It didn't flicker. It was simply there, searing the retina, refusing to disappear.

2. Absolute Darkness

This red light was the only thing connecting us to reality, but it was a distorted reality. It cast long, sharp, trembling shadows on the green board behind. The Professor's erased formulas, the R.T.M he had written in his trembling handwriting, now looked like symbols of an ancient cult, like monsters dancing on the wall waiting for the right moment to pounce.

"Nobody move." The voice cut through the silence like a Japanese knife. It was Professor Shalom, but it wasn't the voice we had heard a minute ago. The hysterical trembling had vanished. The panic, the stuttering, the dread – it had all evaporated. In their place was a metallic, calculated, almost robotic coldness.

"Do not touch your phones," he commanded from the darkness, his voice coming from everywhere and nowhere simultaneously. "Don't try to illuminate with your screens. Every photon of light that enters the system now... will disrupt the measurement."

I heard the rustle of synthetic clothing to my left. Someone shifted in their chair with noticeable discomfort. "Why?" I heard Daniel whisper. His voice was thin, fragile, on the verge of tears. "Professor... what happened to the power? Is it the building's main fuse? Or the whole campus?"

I waited for an answer. I expected a logical explanation. Something about generators, an overload, the storm outside. Instead, I heard a rough, dry friction sound. Scrrratch. A match struck against a box. The sound was disproportionately loud in the silence, like a gunshot.

And then – a flash.

A small, orange, trembling flame ignited in the heart of the darkness. It was small, almost pathetic against the gloom enveloping us, but in that moment it looked to me like a bonfire of hope. It illuminated the Professor's face from below, an effect that created a grotesque distortion. The shadows turned his eye sockets into deep, empty black holes, and the wrinkles around his mouth into deep cracks in dry earth. He looked like a demon, or a prophet of doom at the moment of revelation.

He didn't look at us. He looked at the dancing flame between his fingers as if it were the most interesting thing in the entire universe. His eyes reflected the small fire.

"The power didn't drop, Daniel," the Professor said quietly, his gaze slowly rising from the fire to us, scanning us one by one, lingering on every terrified face. "We are not in the dark because a fuse blew. We are in the dark because we stepped out of the continuum."

He brought the match closer to the device, and the red light of the number 1985 blended with the orange of the fire.

"Welcome to the Quantum Toolbox."