Abstract
Of course all considerations of the dimension problem are 'spatial," or at least they never manage without spatial metaphors. However, the categories 2 to 5 listed in the introduction bring many additional definitional or descriptive means to bear. Therefore, the approaches which are treated in this first section have been named "purely spatial." In these neither motion nor force, propagation nor conditions of perceptions are considered. This is at first, of course, a negative distinction.