RULE: "When a surface changes shape or scale, but its elevation remains the same, its shadow should not change." However when a surface does change elevation, it's shadow should also change accordingly.

University of Michigan - Ann Arbor

"Shadows provide useful cues about a surface’s direction of movement and whether the distance between surfaces is increasing or decreasing." 
- When an element changes elevation, its shadow should change. 
- When an element is changing shape or size, but elevation does not change, the shadow should stay the same. 

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