Must utilize an external lens, excluding the camera lens and any direct attachments. Examples of acceptable elements are corrective eyeglasses, magnifying lens, glass ball, water droplet, filled transparent container, curved make-up mirror, chrome hubcap.

The “curve” may be one- or two-dimensional, but not flat glass or wrinkled aluminum foil. The auxiliary optical element should be identifiable, and the reflected or refracted objects should be a major component of the image.