Ok this the best comment on my work I got so far, thank you so much! I really appreciate it that there are other people who value the outcome as much as I do.
As you said it is quite silly but I think it represents our surrounding nature and our world so good: as a quite fragile ball floating in space which we have to take good care about :)
I didn’t thought it would get so hot, but the moss ball has quite some weight to it which needs more power to keep it centered. It weighs ~500g when watered.
The purpose of the electromagnets in the base is exactly to keep the floating magnet at the bottom of the moss ball centered. There are hall effect sensors measuring indirectly the position of the floating magnet and correct the faintest misalignment. The more mass the more power is needed, that’s why it gets so hot.