In a Montessori classroom, the cylinder blocks give a child the opportunity to practice their visual discrimination of shape and size. The solid, cylinders have insets that fit perfectly and attractive knobs that simply beg to be grasped.
I introduced these into my infant classroom to see what would happen. They have not only been well received, but now a favorite gathering spot for all of the children. There is something about this material that draws the child in, both to fitting the cylinders and also to watching the roll around the room.