"Green Symphony" is the first wall installation in Poznań. The arrangement of pipes and gutters creates an orchestra, which during the rain will "play" composed by falling rain drops symphonies. 
 
The installation is located on the wall of one of the tenement houses at ul. Ostrówek 17. These are giant silver instruments attached to the wall that make up the orchestra. The cello, organ, saxophone and percussion make sounds when water flows through them.