What happens when I pound this mushroom into the base? Aha The other mushroom comes up Children will love playing with the Pounding Mushroom toy from Plan Toys. While they're playing, they will develop hand-eye coordination, strengthen their grip and learn about cause and effect. Sturdy green base and colorful mushroom tops are made of ecofriendly, safe and sustainable PlanWood; hammer and mushroom bases are made of solid wood. Appropriate for children ages 12 months and over. Dimensions of base: 6.6 in x 4.0 in.