I wonder if this condition is related to other perception alterations, such as dyslexia or dysgraphia? I also wonder how well his clothes match or if it is only print that alters in color....
This is somewhat related to some forms of dyslexia (note the weasel words.) For some people, numbers exist in certain places, for example maybe linearly 23,1,27,14,444,33,2,0,17, etc. For others the numbers are in a two-dimensional array. (I don't know of people who see numbers laid out in three or more dimensions.) These people have trouble learning arithmetic because the operations on the numbers are not related to their idiosyncratic order. They must learn arithmetic algorithmically and ofter have no intuitive feel for magnitudes. Other people see days of the week or months in some patterns.
I see the year as a circle, Christmas on top and July 4 on the bottom. Week is the same, Wednesday on top and Sunday on the bottom. At least this doesn't contradict operations on dates. I see numbers in a great line stretching from negative numbers to positive (I don't know if from left to right or vice versa, just a line.) The line turns a corner somewhere arount 100 or so and shifts to a logarithmic scale. Integers are bumps on the line. So are rationals, and algebraic numbers (different types of bumps.) No colors though. Nor do I hear colors in musical keys. (Assignment of colors to keys is not consistent across people.)