https://www.youtube.com/watch?v=1cUUfMeOijg
(Mention of the London pendulums at 2:39)
Method for seeding a pseudo-random number generator with a cryptographic hash of a digitization of a chaotic system
https://patents.google.com/patent/US5732138A/en
https://www.youtube.com/watch?v=1cUUfMeOijg
(Mention of the London pendulums at 2:39)