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it will tend to quicken your observation, and this is worth any extra trouble or discouragement that may be entailed. There is a temptation to look continually at our models, and in consequence we look at them more often than is necessary.
If, after looking at the model, we hide it from sight and then proceed with our drawing, obviously we must work from memory. The habit of working without models is soon developed, and it adds enormously to our powers of 'taking notice.'
