Painting with light.

My wife is such a good sport. She puts up with all my crazy ideas and models for me whenever I wanna try something new. So I've been reading about this technique called painting with light. If you're not into photography then the explanation is kinda boring ( ask me if you want more details)... In a completly dark room we opened the shutter on the camera for 20 seconds, then I come in with a flashlight and "paint with light" the areas I want to show up in the picture. So yeah Johnna had to sit still like that for 20 seconds. Fun huh?