Go to a darkened room (garage, lights out is perfect)
Set camera on a tripod or on top of a table, chair, or something non-moving
Camera settings: Manual Mode // Shutter Speed 3 seconds (3") // Aperture f5.6 // ISO 100 // Manual Focus
Look through the viewfinder and focus on your subject across the room. They should be holding up a small flashlight so you can see to focus on them.
Take a photo and during the 3 seconds, have the person wave the flashlight around to create the desired shape. You will get something similar to what you see in the slideshow to the left.
Exposure Triangle Component 1: Aperture
Exposure Triangle Component 2: Shutter
Tech Download: Slow Camera from the app store.
Professional Photographer Spotlight//Kien Quan