The Imbucare Box with Rectangular Prism introduces toddlers to a slightly more demanding shape-matching challenge than the cube, as the child must orient the prism correctly before it will pass through the aperture. This orientation requirement makes it a strong next step in your Imbucare sequence, encouraging spatial reasoning and refined wrist rotation in children roughly 15 to 24 months. It pairs naturally with the cube and cylinder boxes when you are building out a complete object permanence progression on the shelf.