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.
She & Him Concert Poster at Bimbo's 365 Club- San Francisco Nov 2 & 2008 hand made two color silkscreen print poster measures 18 inches x 24 inches hand signed & numbered edition of 200 artist: Jason Munn (The Small Stakes)
"Stargazing is like time travel." This design is very well balanced and contrasted well. They use the black and white contrast the stars against the black sky. And they use shapes in a circular motion to reveal more like a time travel warp zone.