There are two categories of the laser effect. One is Beam Effects show the laser beam that progressing in the air to the audience, the other is Screen Effects show the laser graphics on the screen that drawn in moving a laser spot on the screen. The first one is used better than second. The beam effect is very exciting, so that many Laser Light Shows are also being given. The laser machines working in the laser light show are called Laser Projector. Here’s how to make one… Link.