Muzzle - or also a musical puzzle, is a prototype of a toy aimed for children with limited vision. Its pieces are in a shape of a trapezium in order to avoid confusion when assembling the puzzle. Each piece contains a fourth of a famous children’s song (Incy Wincy Spider) and the idea is to assemble them in a chronological order, so that the song will play out in the correct way. The emphasis of this exercise is to concentrate upon developing the memory skills of young children, especially the ones with difficulty seeing. The material on top of each piece is an indicator of the correct way to insert the piece, and the bright colour is  purposely chosen to stimulate the vision.
The electric circuit has been developed with the help of an extracted keyboard chip and the software program Abletone, assigning each piece to a different part of the song.