In Gibsons Theory of differentiation, babies are constantly looking for ways to overcome obstacles. As their perception changes so does their approach to the obstacle. This is evident when a child tries to descend the stairs. First they may try by sitting on the stair and scooting down one stair at a time. After they become comfortable with that they attempt holding on to the railing and descending on foot down and then feet together. Finally they will descend one foot over the other ( Berk, L. 2014, pp 146-147). In pattern perceptions, babies will look for prominent features on a face, and then detect t patterns and complex designs such as noticing the difference between their parents face from their grandmothers. A child will also become