I am always fascinated by watching a young child discover the properties of gravity. I remember one grocery store experience, where my daughter repeatedly dropped things from her seat in the cart to the floor. She thought it was very entertaining to watch Mommy pick it up and kept repeating the activity. As we were standing in line to check out, a woman noticed my frustration. She said to me, “Isn’t it wonderful she is exploring gravity!” This kind woman’s perspective helped change my attitude from one of annoyance to one of amazement. Any toy that allows your child to discover gravity will be popular in your home, and the Rainbow Roller made by Alex is a wonderful natural toy. I have seen several different versions of the Rainbow Roller in various Montessori catalogues, but we have the one made by Alex (it can be purchased through Amazon or Magic Cabin). The brightly colored Rainbow Roller is aesthetically pleasing and made of environmentally friendly rubberwood. It comes with two single cars and one double car. The Rainbow Roller is rated for children three and above because of the small wooden wheels on the car; however, my son has been playing with this toy since he was one. Hearthsong offers a larger version of this toy.