Every time I hear or read some absolute statement about something related to perception (mostly visual), I think about "The blue boy" (http://en.wikipedia.org/w

Every time I hear or read some absolute statement about something related to perception (mostly visual), I think about "The blue boy" (http://en.wikipedia.org/wiki/The_Blue_Boy http://en.wikipedia.org/wiki/The_Blue_Boy). Never use blue as a foreground colour... There goes another principle.