The laser isn't science fiction anymore, although happily the lasers on the market aren't deadly ray guns. Lasers form important aspects of computers, sound systems, and video systems. Lasers are also pointers directing beams of coherent light to illuminate multimedia presentations.
Laser pointers come in several different colours, usually red, green, and blue. The light, tightly focused, illuminates a pinpoint spot and lets you make points and focus attention where you want it. Light it up with your own laser.