option classes into different object parts then more complete models of objects if you train the algorithm on a mix of four different classes of objects so there's an algorithm trained on a data set that includes cars faces bikes and airplanes then you know you end up with at the mid level you get features that are shared among the different object classes where I don't know maybe what I guess are new cars and motorbikes both have real tire like shapes or your features that kind of shared between multiple object parts and then the