TRUC is a "thingummy" that makes sounds and music when you put wooden cubes on it. It's the first step I took in interactive objects building. It was back in 2008, when I was in highschool. I IR-upgraded it in 2014 and used it many times as a simple curiosity in exhibitions and as a live controller for playing music.
In its default configuration, each cube color represents a family of sounds (rhythms, melodies...) and each face plays its own sample. You can modulate volume and pan of each cube by moving it up/down and left/right. Additional objects are added to control tempo and various effects.