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I love Calvin’s dad’s expression in the third panel:
I’ve always wondered what this graph looked like. A graph which increases is mirror symmetric to one which decreases, and they can’t be interconverted by rotating the paper.
True. Although Calvin looks to be only rotating the paper by 90°, which would work as long as the original line is continuously increasing on both axes. Not so much “upside down” as “right-side up”, tho.
Ah, so he was originally reading it “sideways”, rather than “upside down”. That makes more sense graphically, though it doesn’t match what Calvin says.
