Sadly this will be picked up by the street-cleaners. You have to fix it to the ground.
In Cologne are active street-artists. One team is painting old bikes to pink and and you can find these bikes all over Cologne. Another team is doing colorful scarfs and put them around street-lamps. You can find abstract subjects which hang at street-lamps or mosaic-pictures on house walls. All this stuff belongs at their places. Cologne is real tolerant. I guess if you take a closet near the univerity of art and fix it to the ground (a place where nobody is driving with a car....) they would do nothing. On the other hand, this is all planned art.
The photo you took is something special because the "owner" didnīt know about his art.