Two non-orthogonal axes
https://gyazo.com/61c224d89dcb296973b92ad3c1497eba
When drawing two axes, we tend to unconsciously make them orthogonal.
Because that's what I'm used to seeing.
But that diagram implicitly makes the strong assumption that X and Y are independent.
When you increase or decrease the Y of something, the X of it remains the same."
In reality, it isn't.
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