Visual texture is the illusion of a 3-dimensional surface. A 2D surface can be made to "look" 3D simply by adding texture and depth to the picture. You may not be able to "feel" the texture but you can still "see" that it is there. In some cases, a viewer is almost tempted to reach out and touch the picture, thinking it will have a real texture. Texture is yet another clever way to deceive the eye into thinking and seeing something that really isn't true.
J.M
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