Octave, an interactive sound installation produced in collaboration between a sculptor and an electrical engineer. The idea behind it has been to abandon the classical method of playing traditional musical instruments and to demonstrate a different approach to producing a melody. Its rectangular minimalist forms are actually a keyboard, on which an octave can be played by touching a metal surface, while the round form serves to change between the instruments. The minimalist forms that begin with smaller rectangles and then increase in size with distance are a simplified representation of the way in which a sound wave spreads. The installation is intended to communicate with the audience – from a single person, who can play one tone after another by moving between the rectangles, to cooperation between several persons, who can play chords by simultaneously pressing on several tones.