ABSTRACT
The most common definitions of the screen characterize it as a more or less large surface on which information is displayed (text, still or animated images, interface controls, etc.) by projection, transparency (slide), scanning, or contact. A screen designed like this is a physical object. I would like to show, here, that to understand what happens in a number of communicational situations, it is necessary to introduce, in opposition to the physical screen, the concept of the mental screen.
