The angle between two intersecting lines is the acute angle between the direction vectors of the lines. Find the angle between the line through the points 
and 
and the line through the points 
and 
.
Definitions:
Depth Cue
Are visual or auditory indications that provide information on the relative distance of objects from an observer, aiding in perception of depth.
Interposition
A visual signal that an object is closer than the ones behind it because it obstructs their view.
Half-Moon Contours
Shapes or outlines that resemble the crescent form of the moon at either its first or last quarter phase.
Brighter Colors
Refers to colors with a higher luminance or intensity, often perceived as more vivid or more reflective of light.
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