It is originally from the C64 demo ”Andropolis” by Booze Design and Instinct. Coded by Andreas Larsson, the guy/genius who ported Eye of the Beholder to the C64.

Here is the same thing in turbo mode on an Ultimate 64:

https://youtube.com/shorts/fF2IXTwWDPQ?si=ds5-5Kwm95Zj2vtf

And with no vsync:

https://youtube.com/shorts/hvmNnwz7ENQ?si=mDVQLWx3T8hnrbuC