Ubi de feo points out this interesting musical interface – the reactogon . . . er, “reacTogon” to be specific. Arpeggio notes are determined through the relationship of individual tiles placed across the surface, each tiles symbol determining note behavior. The device seems to be a variation on the ReacTable but structured in a tile pattern reminiscent of the Electroplankton DS title (or perhaps your bathroom floor?) – reacTogon on YouTube

Related:

reactable – multi-user electronic music instrument

Music made with Electroplankton