1. A door (1 ) adapted to be movably secured to a perimetric framework (2) surrounding and delimiting the opening to be closed; said door comprising a flat body (3) which is dimensioned so as to substantially follow the shape of the opening delimited by said perimetric framework (2) and which is movable from and to a closed position in which it is arranged with the perimetric edge abutting the perimetric framework (2), to close the same; said door being characterized in that a first face (3a) of the flat body (3) being provided with at least one backlit panel (9), and the door (1) being provided also with a presence sensor (10) which is adapted to detect the presence of a person in front of the first face (3a) of said flat body (3), and an electronic control unit (11 ) which is set to switch on one after the other the backlit panels (9) gradually as the distance detected by the presence sensor (10) decreases.
