The picture above shows a path in which the bottom of the path is closest, and the path leading behind the trees is farthest away. This is a good example of how our vision takes in information of overlapping to represent depth. Since the trees overlap the path in the sunlight, we can perceive that that portion of the pathway is farther away, at least from the trees. The path towards the bottom of the image seems to be not blocked from the trees, indicating that it is in front of the trees. By transitive property, the shaded path must be closer than the sunlit path.