"This longing for knowledge makes the real artist brave. He never adheres to the first image that appears to him, because he knows that this is not necessarily the richest and more correct. He sacrifices one images for another more intense and expressive, and he does this repeatedly until new and unknown visions strike him with their revealing spell."

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It is well-known that those who have charge of young infants, that it is difficult to feel sure when certain movements about their mouths are really expressive; that is when they really smile. Hence I carefully watched my own infants. One of them at the age of forty-five days, and being in a happy frame of mind, smiled... I observed the same thing on the following day: but on the third day the child was not quite well and there was no trace of a smile, and this renders it probable that the previous smiles were real.

— Charles Darwin