"The best opportunity for pure esthetic enjoyment. This requires that beauty be observed as a unity, and that for the brief duration of any pure esthetic experience the cognition of the observed object must completely fill the spectator’s cosmos. There can be no extraneous thoughts—no question about the creator of the phenomenon, its structure, what it resembles or what vanity in the beholder it gratifies. “The purely esthetic observer has for the moment forgotten his own soul”; he has only one sensation left and that is exquisiteness."
“The Problem of the Wilderness”
Scientific Monthly 30, February 1930, Bob Marshall.