montessori box with knitted ball. The range of Montessori learning materials available today are inspired by the ideas and products developed by Maria Montessori in the 1920s and produced in collaboration with Albert Nienhuis. Nienhuis Montessori products are made by hand in small batches in Holland. After exploring the Object Permanence Box with Tray, your child can move on to the added challenges of the Toddler Box with Knitted Ball. A soft cotton ball is pushed into the hole in the top of the box and then removed by pulling the drawer knob and lifting it out in this exercise to develop hand-eye coordination, sophisticated hand movements and simple problem solving skills.