Symmetry

Symmetry mirrors elements left-right in the frame. You can find it and frame it in the world; you can also create it with a mirror effect in editing. 

Repetition

Creating a sense of depth in the frame by repeating elements between the foreground and the background. 

Deep Staging

Examples of Deep Staging, where prominent elements placed in the foreground and background create a sense of depth in the frame. 

Projections

Samples from the Internet to get ideas on observing how light creates projections through shadows and (with backlighting) silhouettes. 

Shadows

Silhouettes