“Mix and play” is the simple, mobile exhibition dedicated to the music and physics of sound phenomena. It is successfully presented in the Innovation Centre Mill of Knowledge since January 2016. Exhibition consists of seven, carefully chosen exhibits: On the wave, Heartbeat, Bite a note, Echo, The badum organ, Scream out! and Stick a note, which seems to be the most popular and liked by visitors in other centres. The unique design of the exhibits and using the walls and additional lighting points in the arrangement makes this exhibition suitable for the open (foyer of the science centre) and close (room) space.