In German, it’s “plastische Kunst”. The adjective “plastisch” basically means “three dimensional”, as in “not flat”.
Plastische Chirurgie is plastic surgery - it’s not primarily putting “plastic” into bodies ;) but sculpting a three dimensional form.
You may have seen it by now, but just in case: there’s a bunch of us in the comments whose experience of their ADHD is exactly like yours :)
So, uh, hey, that’s one aspect in which you AREN’T weird ;D