CHARLES DARWIN

"I remember well the time when the thought of the eye made me cold all over, but I have got over this stage of the complaint, 
and now small trifling particulars of structure often make me very uncomfortable. The sight of a feather in a peacock's tail, 
whenever I gaze at it, makes me sick!"

Letter to Asa Gray, dated 3 April 1860,
The Life and Letters of Charles Darwin