A plate on this painted bicycle's rear wheel reads that it is a memorial to a person hit by a car while cycling here:
White colour and abundance of small parts make this installation so defenceless and fragile, as well as piercingly sad. Really love the idea.
Still, can't help mentioning that this also a great idea for everybody who doesn't want his or her bicycle stolen or stripped of everything detachable.
Fasten a plate and a flower, paint it white, and you'll be able to park it in any area.