Emergence. I spent a lot of time doing this, knowing what it was doing and being mesmerized that this was possible.
In late 1990, I downloaded Conway’s Game of Life from Usenet – comp binaries ibm pc 26-NOV-90 – it was UUENCODED – and I put it together – to run on the IBM PS/2s in the “other” computer lab at college as they had the color VGA monitors.
Amazed I found the same one I used, 31 years later. Runs fine under DOSBox.