Another principle of Gestalt is CLOSURE. For closure, the mind supplies the missing pieces to "close" a form, composition, etc.
In the image below, there is no actual lightbulb. The mind wants to close the shape formed by the hand while the hardware at the bottom aids in the suggestion of "lightbulb".
The next well-known logo for World Wildlife Federation uses closure to create a panda bear.
STUDENTS: ONE SAMPLE OF GESTALT CLOSURE
FInd a sample that demonstrates Closure. Use a photograph, painting, logo, or layout. Do not use one of the simple black diagrams that usually come up for Gestalt - push yourself further than this.