I believe this has been done for decades - am I wrong?<p>Even Lava lamps have been used for rng (<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Lavarand" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Lavarand</a>).