Diffractive Optical Element: The patches of microstructure on the surface of this transparent plastic are far field holograms- transmission holograms, but with the image at infinity. Designed to produced images via constructive and deconstructive interference of passing coherent laser light. However, the images can also be seen by looking through the film at a point source of light, although they appear a bit blurry as the white light is spread into a diffraction spectrum rainbow of colors. ➡️ F