"It's Not About the Nectarine" 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. Again, this happens only when you are looking down on a scene. How much each object leans will depend on the angle you are looking from. I recommend using your viewfinder to compose your scenes - it is then easy to see the angle of the lean by comparing it to the vertical lines of the left and right sides of the viewfinder.
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