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Yet The Mental Impression: The student was advised to develop his negatives on the very day they were taken "whilst yet the mental impression of what you are trying for is fresh." He rejected retouching as "the process by which a good, bad, or indifferent photograph is converted into a bad drawing or painting.... The technique of photography is perfect, no such botchy aids are necessary." For printing he advised two processes, the platinotype and photogravure, or photo-etching.
The stereoscopic effect is an endeavor to imitate nature, while the object of an ordinary photograph, or drawing is only to reproduce an impression of nature. The failure of the stereoscope in its greater aim is more marked than the less ambitious but more practical endeavour to reproduce on a flat surface an impression of what we see.
Gold and silver were apparently scarce, which may explain why many silver cups, bowls, and beakers were made of inner and outer sections that were soldered together to give an impression of great bulk and weight. Favorite T'ang decorative techniques included embossing and chasing. Much was borrowed from Sassanian art and translated into Chinese forms, but the traditional Chinese ornamental repertory of such motifs as dragons and phoenixes was also employed.
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