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Characteristic reflection patterns are often found in sheer materials, such as sheer curtains, where folds modulate how much light passes through or is reflected from the material. (a) An underskirt can be seen through the sheer red robe. Hua Qing in Her Bath by Kang Tao (1723–1795). (b) The material the woman holds in her hand appears transparent, although there are no X-junctions. Fresco, Pompeii.
