“The extent to which perception and, consequently, vision are dependent upon memory and imagination is a matter of every day experience. We see familiar things more clearly then when we see objects about which we have no stock of memories. The old seamstress, who cannot read without glasses, can see to thread needle with the naked eye. Why? Because she is more familiar with needles then with print. In man who can work all day at the office without undue fatigue of the eyes is worn out by an hour at the museum and comes home with a splitting headache. Why? Because in the office he is following a regular routine and looking at words and figures, the bike of which he looks at every day; whereas in the museum everything is strange novel, and outlandish.”