I have taken some practice images of my dancer using the silloette technique. I have also done some practice videos and I can definately see the difference between the first ones at our first location and the second one in a different location.
Here are a few of the first images in the first location.
These were my first attempt.
Then we moved to a different location and tried something else. We found a white screen in front of a stage, so we pulled the curtains across so that it was dark behind and had the dancer against the screen. This is what it turned out like: