The Reactable is a new electronic musical instrument with a simple and intuitive design, which enables musicians to experiment with sound, change its structure, control its parameters and be creative in a direct, refreshing and unseen way. It uses a tabletop tangible interface, which allows the performers to control the system by manipulating tangible objects and with their fingers. The instrument is based on a translucent and luminous round table, and by putting these pucks on the Reactable surface, by turning them and connecting them to each other, performers can combine different elements like synthesizers, effects, sample loops or control elements in order to create a unique and flexible composition. Reactable’s pucks represent the building blocks of electronic music, each one having a different functionality in sound generation or in effect processing, in a way deeply inspired by modular analogue synthesizers such as those developed by Bob Moog in the early 60s.