“1_1_2_3_5″ is an interactive sound installation, consisting of six in a circle arranged loudspeakers and three likewise in a circle arranged microphones in the center.Words, tones and noises, which are taken up in the area by the microphones, go through a program, where the sound fragments are stored for a certain time and repeated in a certain rhythm. Each repetition is assigned to its own sound output, whereby each output is connected with one of the six loudspeakers. So the sound signals rotate from one loudspeaker to the other in a clockwise direction. The rhythm of the repetitions is set by the fibonacci numbers (1_1_2_3_5_8 …), whereby each number corresponds to the time in milliseconds, at which the repetition is caused.