The custom audio-visual code, aka "demos", were limited by the size of the floppy disks (1.44mb) that were traded around - by hand.

" The demoscene is an international computer art subculture focused on producing demos: self-contained, sometimes extremely small, computer programs that produce audio-visual presentations. The purpose of a demo is to show off programming, visual art, and musical skills. Demos and other demoscene productions are shared at festivals known as demoparties, voted on by those who attend, and released online. "

" The demoscene's roots are in the home computer revolution of the late 1970s, and the subsequent advent of software cracking. Crackers altered the code of video games to remove copy protection, claiming credit by adding introduction screens of their own ("cracktros"). They soon started competing for the best visual presentation of these additions. Through the making of intros and stand-alone demos, a new community eventually evolved, independent of the gaming and software sharing scenes. "
~ https://en.wikipedia.org/wiki/Demoscene

https://www.youtube.com/results?search_query=Demoscene

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