The Hard Maths: Elevated

These things pop out of the demo scene competitions all the time, but they're as seldom impressive as this: Elevation is landscape and music generation in 4k, and it really does blow away any of the mathematically generated cleverness I've seen before. It'll black out your screen for a couple of minutes while it loads. Thanks to Tom for the tip. (Video embedded after the link, in case you can't get it working.)