The Cacophany Bell, conceived by Dutch Shoreditch-based designer Tord Boontje and developed with kinetic objects company Laikingland, is more than just a tangle of bent rods and random objects — it’s actually a doorbell.
When visitors push the doorbell button the whole structure starts to tip first one way then the other, causing a hammer on wheels to career round the track and bash into any objects the owner chooses to hang along it’s path.
Via Dezeen.