Paper cuts
This is stuff you look at and think, how is this even possible? Not just, How do they do it, but What is the trick, why can I not see the trick they're playing?
At the same time, the very idea of manipulating material at that almost subliminal level -- look and see how tiny strips of paper have to be turned to 3D shapes -- fills me with the sort of quantum dread I wrote about, inadequately, in this post. In some way, the idea of descending to that level of detail provokes in me the sensation of tumbling into the abyss. I think it's why I was never a very accomplished drug-taker. I don't think my consciousness takes kindly to being heightened.