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you see that it's a little bit --
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let me -- so that's what we just saw.
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But notice that if I turn it over
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there's a little -- there turns out here at the edge to be a little bit of a gap,
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because the top one is just very slightly curved.
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And now let me see if I can see something.
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I can't see it yet, let me zoom in.
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We're going to need to focus on that.
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Ah, see that thing, see that.
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There. Okay, so here's what you're seeing.
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In the middle is what's called Newton's Rings.
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They look like that.