Mark's 'Waterboard' uses the mixed media of new digital display technology with traditional pens and erasers to encourage creative thinking about the natural progression of the earth's water supply. It is a large, interactive installation that gives the user a chance to play with flowing water without getting wet, and consists of a wall-mounted white opaque board (2.2m x 8m) with four projectors and four cameras providing back-projection and detection. The sound of running water enhances the visuals. Several users can play at once, and can use the tools provided to draw or erase objects to try to control the flow of the water. The concept is playful, yet educational. The water will follow its own course, whatever the intervention. Abstract life forms may appear in some areas of water and where the water is stagnant it will become cloudy and discoloured.