Eye-pleasing design and sensory-stimulating fun come together with the Curvy Click Clack marble run by Plan Toys. You won’t mind at all if it’s left out after playtime. Little ones place the marble at the very tippy-top and let it roll down on its own. They will listen and watch as it pleasantly jumps from track to track and rolls over the four different speed bumps designated for each different color. Best of all, it’s made from organic materials and painted with non-formaldehyde organic color in a system that is Eco-Friendly down to the last detail.