Dorothy, off to see the Wizard of Oz, perceives that the Yellow Brick Road converges to a point way off on in the distance, due to the depth cue of:

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Linear perspective is the depth cue that makes parallel lines appear to converge as they recede into the distance, which is what Dorothy is perceiving with the Yellow Brick Road. Interposition occurs when one object blocks another, giving the impression of depth. Binocular disparity is the slight differences in the images seen by the two eyes, which allows for depth perception when the brain combines these two images. Common fate is the perception that objects that move together are part of the same group, but it does not pertain to depth perception.

Dorothy, Off to See the Wizard of Oz, Perceives That