Lava lamps for encryption
It is a fairly well-known fact that cloudflare uses photos of ~100 lava lamps when creating encryption.
The camera takes photos at regular intervals, which are stored on the computer as a series of numbers.
These numbers are the starting point when creating reliable SSL/TLS keys.
The need for such a creative solution is simple - computers by their nature do not know how to do things "at random".
You can learn more about this from cloudflare themselves: