Montessori Imbucare Box with Interchangeable Lid $ 21.55 Montessori Imbucare Box with Interchangeable Lid Children engage simple mathematical skills as they match the shape to the hole in the box, practice cause and effect principles as they post the shape into the box and challenge their understandings of object permanence as they figure out where the shape has disappeared to. Material: High quality solid wood and non-toxic water paint Recommended for: 0-4 Years