The Georello Jungle construction set introduces some simple principles of mechanics in a fun and creative way. First interlock the blocks to make a base and then use the connectors to insert gears so that they can all move at the same time. Next decorate with the jungle animals and trees and get a spectacular chain reaction by turning the crank to get the animals twirling. Georello Jungle is durable and completely safe; it is made of soft, washable plastic with rounded edges.