Why in the disco, is much lasers? Of various colours?

Question: Why in the disco, is much lasers? Of various colours?
- Keywords:
  colour,
  laser,
  light
Asked by pedro123 to Jimmy on 14 Mar 2013.
- James Holloway answered on 14 Mar 2013:
  
  Just because it looks cool and is fun! Like fireworks or balloons its just decoration. They are not powerful lasers and can’t hurt you.

Question: Why in the disco, is much lasers? Of various colours?