Crystallization: a concept which describes the process, or mental metamorphosis, in which unattractive characteristics of a new love are transformed into perceptual diamonds of shimmering beauty "What I call 'crystallization' is the operation of the mind that draws from all that presents itself the discovery that the loved object has some new perfections"

Theory developed in 1822 by the French writer Stendhal as an attempt to describe the act of "falling in love" and how the moment one begins to take interest in a person, one no longer sees him or her as they really are, but as it suits one to see them.

(from wikipedia)