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.
Graphic designer and illustrator, Nabhan Abdullatif, from Oman specializes in conceptual illustrations and vector art. His works are a collection of visual puns where he uses everyday objects in his illustrations along with clever captions.
Spanish photographer Yago Partal created this funny photographic project called "Zoo Portraits", featuring animals dressed as humans. You can check out the full series and buy prints on his website. via Abduzeedo Zoo Portraits