162 MYSTICISM AND LOGIC 



VIII. THE PLACING OF " THINGS ' AND " SENSIBILIA ' IN 



PERSPECTIVE SPACE 



The world which we have so far constructed is a world 

 of six dimensions, since it is a three-dimensional series of 

 perspectives, each of which is itself three-dimensional. 

 We have now to explain the correlation between the per- 

 spective space and the various private spaces contained 

 within the various perspectives severally. It is by means 

 of this correlation that the one three-dimensional space 

 of physics is constructed ; and it is because of the un- 

 conscious performance of this correlation that the dis- 

 tinction between perspective space and the percipient's 

 private space has been blurred, with disastrous results 

 for the philosophy of physics. Let us revert to our 

 penny : the perspectives in which the penny appears 

 larger are regarded as being nearer to the penny than 

 those in which it appears smaller, but as far as experience 

 goes the apparent size of the penny will not grow beyond 

 a certain limit, namely, that where (as we say) the penny 

 is so near the eye that if it were any nearer it could not 

 be seen. By touch we may prolong the series until the 

 penny touches the eye, but no further. If we have been 

 travelling along a line of perspectives in the previously 

 defined sense, we may, however, by imagining the penny 

 removed, prolong the line of perspectives by means, say, 

 of another penny ; and the same may be done with any 

 other line of perspectives defined by means of the penny. 

 All these lines meet in a certain place, that is, in a certain 

 perspective. This perspective will be defined as " the 

 place where the penny is." 



' It is now evident in what sense two places in con- 

 structed physical space are associated with a given 

 " sensible." There is first the place which is the per- 



