“When I lived in Tokyo, I used to watch the crows take hangers from my neighbors’ balconies. (Hangers were used to hang out washing to dry.) The crows would work in pairs to remove the clothing from the hangers and then one would fly off with the hanger. I’d never seen the nests though.”
Tacky Raccoons 
Conceptual Art installations? Nope.
[Images & reader comment found here, via here.]