It was also during this time that Garry built his first metallophone, a xylophone-like instrument made with metal instead of wood. Being a recent college graduate, Garry found the materials for his metallophone at the local landfill - it was made from the aluminum tubes of discarded lawn chairs! Garry was fascinated by the Scales of Olympos, a 7th-century Greek pentatonic scale that can't be played on a modern piano. His metallophone experiment was so successful that he had the idea to cut and tune lawn chair tubes to the exact frequency of the scale and create a windchime from the tubes. It was the perfect instrument that the wind could play randomly.