The second diagram shows two-point perspective to be more complex, because now we have a vanishing point at each end of the horizon line, with the pair as far apart as our paper will allow. This produces a good impression of three-dimensional objects in space, and I have placed three blocks or buildings on the ground (the area below the horizon line). They appear to occupy space exactly as we would see a similar series of buildings in real life. The blue construction lines indicate the areas of the blocks that would be hidden if they were truly solid. Note how that includes all the overlapping areas.
This system is more complicated to construct than the first diagram, but also more convincing in its illusion of depth and solidity. When you come to draw buildings, these technical devices will be helpful. There are other even more complex diagrams for depicting three-dimensional objects but these two are sufficient for most ordinary drawing purposes.
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