This arrow represents Mr. Sunshine's line of sight. He can see the box. Now, what does this have to do with shading? Well, everything Mr. Sunshine can see is in the light. The more easily Mr. Sunshine can see it, the more directly it is in the light. So, because Mr. Sunshine is above the box,
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the top of the box is most directly in the light. So it's gonna be the lightest side.
What about the other sides, though?
Well, Mr. Sunshine is above the box, but he's also kinda to the side. So that means he can see the side, but maybe not as well as the top. So, it's not going to be quite as bright as the top.
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Now what about the front, the side facing us? How do we shade that?
Well, let's look at it from above, to get a good idea of Mr. Sunshine's line of sight. This is Mr. Sunshine, looking at the box.
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Now, though, Mr. Sunshine's vision isn't just straight forward. Just like you, Mr. Sunshine's vision is kinda spread out, and he has peripheral vision. So he can see to this side,
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