Geotropism basically makes plants grow away from the source of gravity, and phototropism makes them grow towards light (and that is usually reversed for roots).
Probably an automated heuristic, you might want to send an email to mods so they can reverse it.
I am going to put the blame on Firefox and Linux Mint but it's honestly impressive how a simple animated simulation can do this.
I would love to be able to control speed. I am curious what the waves would look like at very high speed.
As a wallpaper, a slow speed would be great.
Nice work.