What I love about this, the lava lamp wall in San Francisco, and the double pendulums in London, is that it takes something very abstract and makes it tangible for our team and our customers.
Another much smaller pendulum in the hands-on science exhibits, you scooped sand into it and then set it swinging freely across a square black surface. It would trace out amazing patterns as it spilled sand hourglass-style.
So then some bully would rock up next to me and smack the pendulum, stop it from swinging, and spill a big blob on the formerly-geometric pattern. And they invariably said "just to see what would happen". AStonesThrow would have a small meltdown or become rather indigant. I suppose their empirical science is just as valid as kicking down sandcastles on the beach.
And that's how I came to prefer single-player games...
https://en.wikipedia.org/wiki/Lissajous_curve
The sand pendulum drew lissajous curves as it swung. [I learned it today because they called the ESA Gaia probe's orbit "Lissajous" around the Lagrange point.]
https://www.esa.int/Enabling_Support/Operations/Farewell_Gai...
I used to think the same but here's a counter-example of a (hypothetical) attack based on a malicious entropy source being able to manipulate the hash/PRNG output:
https://blog.cr.yp.to/20140205-entropy.html
Now, it's not necessarily the most likely attack to materialize, as already pointed out downthread: https://news.ycombinator.com/item?id=43391377.