good classic Montessori

I still love the graphics, the method. Transparent circles in two colors that create a third overlay, it's really fun and pulled Montessori. My only regret? The book format is a tad larger than the others (letters, numbers and geometric shapes). Can been difficult to incorporate this theme rough çi, then this is "replaced" by zippers, flaps to lift, etc ... So it is more fragile (but who knows to use Montessori confront the child with the delicacy and fragile objects ...).