One point means one vanish point. In one point perspective we are focusing on the front “face” of the objects. The face is actually the side of the object and not its corners. In the two point perspective there are focusing on the corners while the faces are angled to the Visual points. In the three point perspective there is a third point bellow the two points.  There is also a worm’s eye view where the third VP is above the horizon line. You can see this visual in the gallery bellow.

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