[Negative1]

I did something similar a few years back, except instead of Lava lamps, I used a Geiger counter module connected to an Arduino (scrap from a project I was working on to make something economical for civilian use after the Fukushima Daiichi nuclear disaster). Basically, the background radiation is used as the PRNG number (not just as the seed). I found out later that someone at Sparkfun already did this: https://www.sparkfun.com/tutorials/132