Generating a shadow or a silhouette on stage depends completely on the lighting. All you have to do is position the lights and the person in such a way that his shadow falls in the desired place. A lot of factors come into consideration here, like the time of day, whether light is blocked out of the auditorium completely, on what side does one want the shadow to fall, how big the size of the shadow should be, and so on and so forth.
If one wants just the silhouette of the person on stage, all one has to do is simply put a bright light directly behind the person, this way the audience will only see his outline. Shadow play is an integral part of theatre in many cultures across the world.
If one wants just the silhouette of the person on stage, all one has to do is simply put a bright light directly behind the person, this way the audience will only see his outline. Shadow play is an integral part of theatre in many cultures across the world.