The most vital things in the look of a face or of a landscape endure only for a moment. Work should be done from memory. The memory is of that vital movement. During that moment there is a correlation of the factors of that look. This correlation does not continue. New arrangements, greater or less, replace them as mood changes. The special order has to be retained in memory—that special look, and that order which was its expression. Memory must hold it. All work done from the subject thereafter must be no more than data-gathering. The subject is now in another mood. A new series of relations
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