Säulenheilige is an art project by Christoph Pöggeler. It depicts lifelike sculptures of regular people standing on advertising pillars. When you're not looking for them, they tend to blend into the background but as you walk around they appear more and more often.
I don't know how many there are - I saw at least six before I started to notice them. Keep your eyes out and looking up. You'll spot them.
[Review 16388 overall - 193 in Germany - 1895 of 2021.] read more