"The trick is to feel with your eyes, " he said. "Your problem now is that you don't know what to feel. It'll come to you, though, with practice."
"Perhaps you should tell me, what I am supposed to feel."
"That's impossible."
"Why?"
"No one can tell you what you are supposed to feel. It is not heat, or light, or glare, or color. It is something else."
"Can't you describe it?"
"No. All I can do is give you the technique. Once you learn to separate the images and see two of everything, you must focus your attention in the area between the two images. Any change worthy of notice would take place there, in that area."
"What kind of changes are they?"
"That is not important. The feeling that you get is what counts. Every man is different. You saw glitter today, but that did not mean anything, because the feeling was missing. I can't tell you how to feel. You must learn that yourself."