The last months there was a special exhibition in BMW's HQ museum, with all 20 art cars united.
https://www.youtube.com/watch?v=88ZNlUN9VaM
The star car is this... bewildering that they loaned it to the local BMW dealership where it was displayed without any protection like a used car, just 25 yrs ago.
In 2006 these were displayed locally, too, also without any barriers.