One downside of front screen projection is the risk of casting shadows. This can occur when the viewer's body or other objects come between the projector and the screen. It can be particularly problematic when the viewer stands close to the screen's surface. In addition, the contrast and color saturation may not be as good on front projection screens in areas with high ambient light. Rear projection, on the other hand, does not have this issue as the projector is positioned behind the screen. This allows for a seamless, shadow-free viewing experience. Rear projection screens also tend to perform better in areas with high ambient light, as they provide better contrast and color saturation.