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MINI LESSON: CUPS (5 of 8)
If you are looking down at a scene with cups (or other vertical things) in it, you will notice that the cups not in the middle will appear as if they are leaning. This is again because of perspective. If you imagine a line going straight up and down through each object, you can imagine them converging somewhere far below. This is their "vanishing point."
I have illustrated this with a couple of examples of old paintings. You will notice that the lines go just about straight up and down when the object is in the middle of the scene.