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In our world of one dimension,
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we give it an x and we give it a t.
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Now, that's me,
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and I'm going to give my frame of reference the name S.
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It turns out S is not just based on just my name.
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This is the canonical name for two observers,
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one is called S and one is called S'.
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So, S', let's say, is you.
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So, your frame of reference
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is going to be taken to be sliding relative to mine.
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So, let's draw a y axis here.
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We don't really deal with the y coordinate