Stacking Activity Cubes - These Muiltisensory Stacking Activity Cubes have a number of stimulating features. Baby can watch and hear tons of tiny colorful beads flow through an hourglass. There is a prism to look through, and spinning and clicking activities. In addition, baby can match up circles, triangles and squares to stack these interlocking blocks. Helps develop visual, auditory, fine motor and problem solving skills.