In recent years, green lasers have become inexpensive and easy to get hold of in the form of laser pointers. The human eye is much more sensitive to green light, so the light from these kinds of lasers appears to be much brighter than that emitted from more conventional red laser pens.

A lot of green laser pointers come with a simple filter that scatters the light into multiple beams, creating a grid-like pattern of dots. Many ghost hunters use this pattern to look for motion during paranormal investigations.

The technique was first seen in the US paranormal show, 'Ghost Hunters International.' The idea is that the dots scatter across the walls, floor, and ceiling, and if anything moves in front of the laser, you will see a shift or discrepancy in the grid.

You may think it's easier to just turn on the lights or use a camera in night mode if...