I first spotted these invaders back in 2021. Apparently there were 20 installed in 2006 and a further 22 in 2020.
I found a few more but nowhere near all of them.
This one on Stari Trg.
Židovska steza.
Na Jami on my way to the Ljubljana Computer Museum.
So now I’m up to seven… out of 42… gotta go to Ljubljana again I guess.