92 SCIENTIFIC METHOD IN PHILOSOPHY 



We can now also explain the correlation between a 

 private space and parts of perspective space. If there is 

 an aspect of a given thing in a certain private space, then 

 we correlate the place where this aspect is in the private 

 space with the place where the thing is in perspective 

 space. 



We may define " here " as the place, in perspective 

 space, which is occupied by our private world. Thus we 

 can now understand what is meant by speaking of a thing 

 as near to or far from " here." A thing is near to 

 " here " if the place where it is is near to my private 

 world. We can also understand what is meant by saying 

 that our private world is inside our head ; for our private 

 world is a place in perspective space, and may be part of 

 the place where our head is. 



It will be observed that two places in perspective space 

 are associated with every aspect of a thing : namely, the 

 place where the thing is, and the place which is the 

 perspective of which the aspect in question forms part. 

 Every aspect of a thing is a member of two different 

 classes of aspects, namely : (i) the various aspects of the 

 thing, of which at most one appears in any given per- 

 spective ; (2) the perspective of which the given aspect 

 is a member, i.e. that in which the thing has the given 

 aspect. The physicist naturally classifies aspects in the 

 first way, the psychologist in the second. The two places 

 associated with a single aspect correspond to the two 

 ways of classifying it. We may distinguish the two 

 places as that at which, and that from which, the aspect 

 appears. The " place at which " is the place of the thing 

 to which the aspect belongs ; the "place from which " is 

 the place of the perspective to which the aspect belongs. 



Let us now endeavour to state the fact that the aspect 

 which a thing presents at a given place is affected by the 



