The PinBox is a cube, accessible internally, where each face has a series of holes that house colored plastic tubes: these can be pushed and slid, to a certain extent, in and out.
In this way, a variation in the external volume will correspond to one in the internal space, and of its light, which is also influenced by the reflection in the tubes. Also the sounds from the outside will be varying. The tubes could host Plexiglas tiles with contents for an educational and/or memory game.