Since we're on the topic of entropy
Did you know that CloudFlare uses a wall of lava lamps to generate entropy for private keys?
https://relay.utxo.one/efb93c8a4f0e7198f7c5457ef7846c1de70ff9882ee10d...
Not sure why, but that did make me think of the chaotic nature of a double pendulum, and wondering if that would be useful in some way.