Glass tubes suspended in the air, hammers controlled by an Arduino, microphones recording each glass tube, upplodaing to server giving a digital representation,

Rain will evaporate is a composition with no end. The harmonic evolution is determined by minute differences in tuning between the four glasses as it rains into them and water evaporates from it. The gradual deterioration of the water in the tubes and the leaves that fall into the glasses further influences the pitch. The installation is recorded twice a day and can be listened to at http://www.henrikfrisk.com/cgi-bin/rain.cgi. These recordings are made with simple pickup microphones which makes the recording quite noisy.