Cloudflare uses lava lamps in the lobby of their San Francisco office to generate random numbers for cryptography. The unpredictable flow of "lava" in the lamps is captured by a camera, and the video feed is fed into a Cryptographically Secure Pseudorandom Number Generator (CSPRNG). This system, known as LavaRand, serves as an additional source of randomness for their production servers. The idea was inspired by a similar system proposed by Silicon Graphics in 1996.