SPACE 5 



the case of the sense of touch only by demonstrating that at 

 different places on the skin the sensation of touch remained 

 the same, whereas the local signs changed. It is easier to 

 get this proof by using the retina of the eye. The individual 

 elements of the retina are not all directed on the same colour- 

 quality, though they are all directed on the same local quality. 

 No one will deny that at the place he is regarding any colour 

 whatsoever may appear, and therefore place and colour are 

 factors independent of one another. And from the outset we 

 were able to assume that the touch-qualities might everywhere 

 be different. 



If we turn our eyes skywards and do not move them, 

 what we see looks like a uniform blue surface : if we look 

 earthwards in the same way, all manner of surfaces present 

 themselves, arranged together in series. Each surface is 

 complete in itself, but the unity of the whole visible world 

 is nevertheless preserved. It remains always the same, how- 

 » ever much the coloured fields of view may alter, because it 

 is based on the simultaneous sounding of all the local-signs, 

 a consonance which tells us of the enduring presence of 

 the extended. 



In contrast to the visible, the palpable is never simul- 

 taneously apprehended in all its parts. The palpable is felt 

 as unity because the same touch-sensations return at each 

 stimulation. 



We compared with the musical scale the interrelations of 

 the local signs, since the musical scale likewise forms a con- 

 nected relationship. The degree of the relationship between 

 the individual sounds is determined by their resemblance : 

 by that we determine the qualities that are just appreciable 

 between them. This determination is rendered easier by the 

 recurrence of the resemblance at each octave. 



It is not nearly so difficult to determine the relationship 

 of the local signs, because here a new quality comes in, the 



