[1]https://www.atlasobscura.com/places/encryption-lava-lamps

   Sounds like a PR stunt.  Very slow data rate.  Mix this with output
   from a modern chip-based RNG, and you won't be doing any harm.

   Just an example:

   https://www.idquantique.com/random-number-generation/products/quantis-q
   rng-chip/

References

   1. https://www.atlasobscura.com/places/encryption-lava-lamps