No disrespect to IQ, but 4k and especially 64k demos have a long and rich history of which he's a part.

For example, in 2000 we had this blockbuster realtime ray tracing demo, Heaven 7: https://www.youtube.com/watch?v=rNqpD3Mg9hY

In those days part of the 64k was low level graphics and audio stuff which are these days provided by Windows, to say nothing of shader compilers etc.