CONCLUSION
The subject of color vision 
illustrates so well the 
possibilities of understanding 
otherwise quite mysterious 
phenomena--the results of 
color mixing or the constancy 
of colors despite changes in the 
light source--by using a 
combination of psychophysical 
and neurophysiological 
methods. For all their 
complexity, the problems 
presented by color are probably 
simpler than those presented by 
form. Despite all the 
orientation-specific and end-
stopped cells, we are still a long 
way from understanding our 
ability to recognize shapes, to 
distinguish shapes from their 
background, or to interpret 
three dimensions from the flat 
pictures presented to each of 
our eyes. To compare the 
modalities of color and form at 
all may itself be misleading: 
remember that differences in 
color at borders without any 
differences in luminous 
intensity, can lead to 
perception of shapes. Thus 
color, like black and white, is 
just one means by which shapes 
manifest themselves.