This is inspired by Michael Steven's new video about optics.
He shows off Selenite, which has the property that light entering on one side travels perpendicularly down the crystal until it exits the other side.
The problem with it is that it requires the crystal to be held up to whatever you're looking at. What I'm looking for is a more strict version of it, that actually reflects/absorbs light that isn't coming it perpendicularly.
What I hope to see is a crystal/material that showed an image of whatever's behind it, as if it were on the surface.
Does such a thing exist?