You walk into class and sit down, it seems like any other day, kids talking and chatting, getting their books out, looking at their phones, etc. After a while, the teacher walks in and stands in front of the class.

Ok class, for today's lesson, I need you all to stare at the screen at the front for a bit. No talking, no looking away.

The screen starts to play a strange video, with a hypnotic spiral in many pretty colours, and a low droning noise in the background.