What's a Grip Head?

This weekend, I stopped by Keeble and Shuchat to look for something that would let me hang the home-made screen flash diffuser. I needed to get the diffuser much closer to the subject and mounting it directly to a light stand wasn't working out well.

At the store, there were several other customers renting studio gear. I have to admit I was kind of intimidated looking at all the stuff there. Being new at this, I had no idea what most of those items were. I ended up buying a "grip head" by Manfrotto, that fits on the top of a light stand and allows a boom (a steel rod) to extend horizontally. The grip head cost about 39.00 USD and is very well made. In this photo, you see a lightstand at the left, with the grip head holding a boom. The skylight panel is attached to the end of the boom close to the model. Notice how even the lighting is on her left side. The flash is softened quite a bit.