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). This is the how the child recognizes invariant features. The stairs do not change but as the child becomes more comfortable with the stairs the stairs become less threatening. In this case, the child is able to slowly allow himself
