montessori wooden trays. The wooden trays are designed for a variety of practical life exercises, i.e. polishing, folding, pouring, etc. The range of Montessori learning materials available today are inspired by the products developed by Maria Montessori in the 1920s and produced in collaboration with Albert Nienhuis. A great admirer of the educational philosophies and practices that Montessori introduced with very limited resources, Nienhuis committed himself to constructing her materials exactly as designed. Nienhuis Montessori products are made by hand in small batches in Holland. (set of two)