ABSTRACT
Thus it is clear that even a simple path cannot be followed blindly without some idea of its spatial relationship to other objects. In practice the following of a marked path is supplemented by some sort of mental map or schema in which this path is perceived in spatial relationship to other paths and places. In familiar surroundings people are usually quite unaware that they are using such a schema, even though they can orient themselves correctly when placed in an unexpected part of this familiar territory. They can recall the landmarks and other topographical clues in such a well-organized relationship to one another that each landmark can be related to any one of several others and serve for guidance along a variety of routes of travel.
