Why is the Background of the Mona Lisa Unique?

The video explores the Mona Lisa's background, highlighting Leonardo's use of aerial perspective and his connection of humanity with nature. It delves into Leonardo's scientific studies, such as hydrodynamics and geology, which influenced his art. The video also explains Leonardo's visual tricks, like skewed horizons, creating illusions of movement.

How did Leonardo's knowledge of geology influence the background of the Mona Lisa?

What visual trick did Leonardo employ to create an illusion of movement in the painting?