Francis Galton
[Polymath, explorer, anthropologist, inventor, meteorologist, statistician, b. 1822, Birmingham, England, d. Haslemere, Surrey, England.]

 [My composite portrait process] represents no man in particular, but portrays an imaginary figure possessing the average features of any group of men. These ideal faces have a surprising air of reality. Nobody who glanced at one of them for the first time, would doubt its being the likeness of a living person, yet, as I have said, it is no such thing; it is the portrait of a type and not of an individual. (1879) 
 The inferiority of photographs to the best works of artists, so far as resemblance is concerned, lies in their catching no more than a single expression. If many photographs of a person were taken at different times, perhaps even years apart, their composite would possess that in which a single photograph is deficient.