Melodious Building Blocks by HabaThis beautiful wooden marble run from Haba makes a pretty melody and is a super cool addition to any existing ball run or block set. Children love to experiment with sounds and tunes. Arranged in the correct order, the melodious building blocks form a pentatonic scale. Balance the blocks to build the tune, then watch and learn about sounds and movement while watching the balls roll down the track. Haba toys are famous for being just that little bit