I work at a school that uses the Reggio Emilia method. My children are 3,4,5 year olds. This week we made "marble racers." The children designed a racer using a jar lid and other art materials. Then we placed marbles under the lid and "raced" them down a ramp (made from the wood cover to the water table). The children explored how giving a "jet engine push" would increase the speed of the racer. Also, they tried the ramp at various heights. They loved this project! Does anyone have any other ideas for using marbles?