Like many of Leonardo DaVinci’s paintings and sculptures, the Mona Lisa’s dimensions are based on the Golden Mean. Placing the outer limbs at the bridge of the nose and the bottom of the chin reveals that DaVinci positioned the Mona Lisa’s lips at a Golden Mean between the two points.

Place the outer limbs at the edges of her face and the Golden Mean Finder points to the middle of her left eye.

An example from nature includes the nautilus shell.
Its design is also based on the Golden Mean. In this example, the center of the shell is located at the Golden Mean of the outer edges.