Standing on the commuter train platform you glance down the tracks to see if the train is coming. as you do, you notice that the parallel rails of the train track appear to come together and meet in the distance. this is an example of which depth perception cue?

Linear perspective

Explanation:

The relative size and next depth cue and texture gradient, linear perspective is a depth cue that is related to both. In linear perspective parallel lines that recede into the distance appear to get close together or converge. This is the system that creating an illusion of depth on a flat surface. All parallel lines in painting or drawing using this system converge in the single vanishing point on the composition's horizon lines.  

There are three lines important for the composition of a linear perspective.

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