via Ed S

A dramatic demonstration, in 4096 bytes, of the power of libraries, the power of compression, the power of generated content and the power of human ingenuity. See also the PDF explaining the code at
http://iquilezles.org/www/material/function2009/function2009.pdf
and a whole variety of tutorial articles at
http://iquilezles.org/www/
You want maths? See
http://iquilezles.org/www/articles/morenoise/morenoise.htm
The source – about a floppy's worth – at
https://files.scene.org/view/resources/code/sources/rgba_tbc_elevated_source.zip