There is this thing called the Pulfrich effect (https://youtu.be/Q-v4LsbFc5c a Tom Scott video about this).

Since I have 3 monitors, I decided to write a small C++ program which copies the image from the first monitor to the second and, with 5ms delay, also to the third.
That way I can sit down like 5 meters away and squint a bit to make both copies overlap. This creates a 3D effect for about half of the time of any moving video.
If you watched the video at the top you should know why, if the right image comes later the background has to move as in the video, and vice-versa.

Just some random thing that came to my mind and it's actually awesome!