The theory of photography can be taught in an hour, preliminary technical notions in a day... What cannot be taught is the moral intelligence of the subject, or the instinctive tact that puts you in touch with the model, allowing you to size them up and to steer them toward their habits, their ideas, according to each person's character. This enables you to offer something more than the ordinary, accidental plastic reproduction that the humblest laboratory assistant could manage. It enables you to achieve the most familiar, the most positive resemblance: a speaking likeness. This is the psychological side of photography. I don’t think that is too ambitious a term.