Using lasers that emit in the visible spectrum range, it is possible to create impressive visual effects.

When a laser beam pass through a region of humidity, smoke, or any other small particles in the air, the scattered light can be seen by observers from all sides.

In big outdoor shows, when the effect need to be seen from a distance, it is possible by moving a small optical element (such as mirror) to move laser beams over large area.

For entertainment it is common to use lasers which emit few laser wavelengths. First each color is separated, using prisms, to create many laser beams of different colors. Using small vibrating mirrors, controlled by a computer, it is possible to move each laser beam very rapidly, and create moving colored images.

Since our vision is based on seeing the image a little time after it has disappeared, we see a full picture created by laser beam, although the laser beam illuminates each point for a brief period of time.

The first devices were used to create two dimentional moving pictures on screens, but the new devices are used to create three dimentional moving sculptures in space (with small particles in it).

Using emitted laser powers of few watts, it is possible to create big moving images, in free space, an impossible task to create by other means.