Seth loves his Brio train tracks, and it appears to be a benefit not to have furniture in our living room. He puts together a few of the tracks but mostly likes to play with the trains, cars and buses. That is, until his beckoning me away from the kitchen surprised me with this impressive network of tracks and bridges. No joke we didn't help him with it, and he figured out to put blocks under the "up-and-downs" to support it. Little smarty pants!