Both my children just LOVE these balls, over anything else that they received in their Easter Baskets. They've done so many things with them, make "Grape Juice," used in an at home Object permanence box with toiletpaper rolls and a cardboard box, sorta like a marble run. They've sorted them on the boards I bought elsewhere. They have spoken about colors and why is one set different then the others, we know get to talk about pastels and primary colors. They move their bodies is different ways while trying to catch run away balls. SERIOUSLY the best toy! Highly recommend. My daughter is 2.5 and my son is 4.