These look like power converters and are not easy to find. Each level has ten Minikits scattered throughout it and they tend to be in difficult places to reach. When you have found a minikit and put it together you will build a tiny vehicle or location related to the level. Collecting all ten Minikits in a level will help you earn more Gold Bricks and get exclusive items. There are a total of 180 Minikits to collect.