" Optical fatigue-“ Tallant Began.
“Sure. I know every man to his own legend. There isn’t a tribe of Indians hasn’t some accounting for it. You’ve heard of the Watchers? And the twentieth century white-man comes along and it is optical fatigue. Only in the nineteeth century things weren’t quite the same and there were the Carkers.”
“You got a special localized legend?”
“Call it that. You glimpse things out of the corner of your mind, like you glimpse lean, dry things out of the corner of your eye. You encase them in solid circumstance and thy’re not so bad. That is the growth of the legend. The Folk Mind in Action. You take Carkers and the things you don’t see and you put them together. And they bite. "

― Anthony Boucher