This element of design is Negative Space. The hand isn't actually holding anything. It implies that there is a light bulb in the empty space. Negative space guides your imagination to finish the image.
Catwoman vs Black Cat by Mystic Oracle *<<They're debating if they should fight or make-out to troll their perspective heroes/not-boyfriends. Or if they should just run off and steal stuff together. Sisterhood of the Cat.