Trajectory - The urge to throw, drop and other actions that are all part of the Trajectory schema. Some other Trajectory actions are things like climbing up and jumping off (Trajectory of ones own body), putting your hand under running water (interacting with things that are already moving) and the classic, throwing and dropping (making it happen). It can be diagonal, vertical or horizontal...this is a multi-dimensional urge, after all, learning is based on movement in the first years of life.
