The kid was sitting mesmerized in front of their computer for at least an hour thanks to this randomly found gem: https://paveldogreat.github.io/WebGL-Fluid-Simulation/
Webgl Fluid Simulation

A WebGL fluid simulation that works in mobile browsers.

@floe β€œthe kid.” Is that what you’re calling yourself now? πŸ˜‚
@eaganj lol, not in this case, but part of me definitely has stopped growing up at age 12 or so 😜
@floe Thanks. Installed the Android app and didn't even hesitate a second to buy the in-app purchase for a few cents.
@floe I had found this a few months ago looking for another WebGL demo. Very cool. Sadly my pc can't handle it anymore (switched to Parabola and lost GPU acceleration)...
@floe The Android app for this is great too. πŸ”₯😁
@floe ooooh. Shiny! Apropos spending time: https://pong-wars.koenvangilst.nl/
Pong wars | Koen van Gilst

The eternal battle between day and night, good and bad. Written in JavaScript with some HTML & CSS in one index.html. Feel free to reuse the code and create your own version.

@floe

Interesting... but it runs once and then I have to reload the page to get it to go again for a few seconds. Tried multiple browsers

@kbsez @floe I can interact with it and go on for minutes. Did you just load the page and did not interact with your finger on mobile browser (ie paint with the finger?).
@floe Then let it also have a look at https://xaos-project.github.io/
πŸ˜ƒ
XaoS

@floe This is indeed pretty cool
@floe Well that is a *delight* - thank you. Reminds me of hours lost to WinAmp visualisations back inthe late 90s

@floe Just a side note:

The kid was also tricked into the unconsentful transfer of his personal data to Google by this website.

Just so anyone who cares knows.

@nik Good point, although we have a PiHole in our home network that takes care of most adware. And it's not a "he" πŸ˜‰
@floe well, that’s my night sorted.
@floe In the building where I work we have an interactive artwork called "Flow" by an artist named Karl Sims, which uses a Kinect and a GPU to do various physics simulations that are perturbed by the movements of passers-by, including some fluid dynamics ones. Kids love it. (It's intentionally not connected to any network.) According to https://www.karlsims.com/flow.html there's another copy of it at MoMath in NYC.
Flow - interactive visual effects by Karl Sims

Interactive augmented-reality exhibit with fluid flow and other simulations that react to the motions of visitors. On display at the MIT Stata Center.