How to do light graffiti with a nikon d40?

Well?

Do light graffiti with a nikon.com

* set your camera on a tripod
* aim it into a dark area.
* manually focus the lens to where the lights will be
* set the shutter to Bulb
* hold the shutter open while your friends draw crazy things using sources of light, like a pen light, light stick, LED flashlight (torch)
* use a wireless remote (if you are doing this on your own) and locking the shutter open while you make your graffiti
* to get the best colour saturation, adjust the lens aperture