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In page History of Asian art:

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This distinction was often class-based: scholars, particularly in Confucian art felt that one could see colour in monochromatic paintings within the gradations and felt that the actual use of colour coarsened the paintings, and restricted the imagination. Korean folk art, and painting of architectural frames was seen as brightening certain outside wood frames, and again within the tradition of Chinese architecture, and the early Buddhist influences of profuse rich thalo and primary colours inspired by Art of India.