Comment by gbell12

Computers implemented in other computers.

Specifically:

Minecraft running in Minecraft https://youtu.be/-BP7DhHTU-I

or

Game of Life running in Game of Life https://youtu.be/xP5-iIeKXE8

Bonus: Digital clock implemented in Game of Life https://youtu.be/3NDAZ5g4EuU

Surreal because it makes it apparent that our universe could really be emergent behavior from a simple set of rules.