Laser effects, graphics, texts, etc. need projection surfaces to become visible, for example screens. Rear projection screens are made of semi-transluminescent material, often of a gauze / mesh material, which has got many small holes. Such screens do not really reflect the laser light but create kind of a glow or let a certain amount of laser light pass through the material. As one might expect, the graphics, effects or texts are projected on the rear side of the screen.