You unlock this door with the key of imagination. Beyond it is another dimension - a dimension of sound, a dimension of sight, a dimension of mind. You're moving into a land of both shadow and substance, of things and ideas. You've just crossed over into the Just for Laughs Section of Calvinistic Cartoons.
Travel to the distant past in your mind and supply the situation painted above with something so brilliant that rays of light will eminate from your monitor...or just supply something kinda funny.