To be sure, the moment the study passes beyond bare description the student must leave the landscape itself, must go beneath it, even to state what its form represents - to translate the outer foliage of a forest into the forest, the outer surface of buildings into different kinds of buildings, etc.... Our interest in houses, factories, and forests cannot be confined to their surface form; only in the limited field of aesthetic geography could such a restriction be justified. Our very use of such words as house, barn, factory, office building, etc., indicates that we are primarily concerned with the internal functions within these structures, the external form is a secondary aspect which we use simply as a handy means to detect the internal function - and should use only insofar as it is a reliable means for that purpose.