This is another one of my favorite light painting techniques. It is very simple, but creates incredible photos, and if you desire it wouldn't be too difficult to think up ways of making more complex photos.
Physiogram's are rather old actually, dating back to the 19th century, and have become rather lost in time, so here is how I created these interesting photographs.
Step 1: Setting Up the Equipment
First you have to gather the supplies, which shouldn't take very long. The main supplies consist of a flashlight (the smaller the beam of light the better, single LED preferable) and a long piece of string. Tie one of the ends to the flashlight and you are almost in business.
Note: If you're like me you have a bunch of really small single led's lying around. These do not have enough weight by themselves to create smooth physiograms, and therefore need to be tied down with something a little heavier. Anything will work, but make sure you can secure it safely so you don't have objects falling on your camera lens.
Now tie the other end of the string to something attached to the ceiling, hanging down anywhere from 1 to 2 meters from the ceiling (this will be adjusted later). I found my ceiling fan to be perfect for this.