1. A three-dimensional visual effect created by dyeing each of two images a different color, usually red and green, and then viewing them through complementary-colored filters, one over each eye.
2. A stereogram in which the two views are printed or projected superimposed in complementary colors, usually red and blue.

By viewing through filter spectacles of corresponding complementary colors, a stereoscopic image is formed.

3. A decoration carved in low relief, so that the shape of the design projects only slightly from the background.