I couldn't resist the temptation of making a quick riff on this. It would probably get better with some editing, but it is what it is, so with apologies ...
The Manifestation of Mass
"Hyperstition is a concept coined by the Collective Culture Research Unit," Professor Mass waved his arms in front of the expanse of the blackboard. "It captures the idea that imaginations can become reality through collective belief."
Vernon glanced at his phone. Another 20 minutes of this. Shit. Around him the three hundred something other students in the lecture theatre stared as blankly as he felt.
"The space of imagination is an empty slate, a void where ideas can live." The professor gestured at the blackboard.
It was still very clean today, empty and black. This far into the lecture the professor hadn't written anything; it had been talk, talk, talk.
"Once an idea is born it can spread from person to person like a parasite. And if enough people have the same idea, the vision can manifest and become a reality."
'An example, please an example,' Vernon thought. He remembered that old movie, where the World Trade Center was destroyed by an alien laser beam. Was that made before the 9/11 attacks? Must be, right? But had it inspired the attacks, caused them? Bullshit.
"Sattelites, the moon landing, the internet! Every advance was imagined, first and foremost, in the realm of fiction!"
Vernon had read that SciFi stories of satellites had inspired the engineers that eventually made them a reality. That at least made sense. He imagined a satellite tumbling across the expanse of the blackboard to pass the time. He wished aliens would come out of the board to abduct Prof. Mass --- it did not manifest.
"Of course not every idea will do that. Enough people must have the exact same vision at the same time to give it sufficient weight." He drew a circle on the board. It looked like a planet, or a star, or...
"Every person believing in the same vision adds a little bit of weight." He added arrows pointing toward the circle. "This weight bends the fabric of reality. And if this weight is great enough, then BANG!!" He stabbed at the center of the circle with his index finger. The impact rang through the class like thunder, a sonic boom played in reverse. Air rushed. Loose paper, pens and the odd phone were flung to the front as a strong wind tore through the lecture hall.
Professor Mass left a brief afterimage as he was sucked into the black hole that gaped in the center of the circle. It closed as quickly as it had opened and the blackboard returned to its normal matte black self. Throughout the classroom debris clattered to the floor.
Nobody talked as they left the hall, and many guilty glances were exchanged. Was it possible, Vernon wondered, that in that moment they had all had the exact same thought?