Seeing is in some respects an art which must be learnt. To make a person see with such a power is nearly the same as if I were asked to make him play one of Handel's fugues upon the organ. Many a night I have been practicing to see, and it would be strange if one did not acquire a certain dexterity by such constant practice.
In: William Hoyt, Planets X and Pluto, Chapter 1 (p. 12), The University of Arizona Press. 1981