The title refers to the screen because it is not a material product that people are making with this tool-like artwork. The products are composed of flickering light that can be "screened" in a variety of ways.
These restrictions may not appeal to some people. But in earlier online work, I have found that keeping things simple lets more people participate. The emphasis shifts to the many things that are variable. People may wish to produce sequentially related imagery, or not. Some will use words. Some will use symbols. Others will work abstractly. Some will carry on a dialogue with other people who are simultaneously "tele-present." Still others will work alone.
If you would like to use any of the graphics that you find within Screening Circle, you are welcome to do so. The graphics are a collaborative product and should be considered part of the creative commons.