Two 2D Vectors
A teacher questions a student's wrong answer, then is won over by the student's 'Magic Eye' stereogram argument.
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2017-05-08-two-2d-vectors/ (CC BY-NC 4.0)Transcript
Teacher: "How did you get this so wrong? The question asked for a 3D vector, and you gave a pair of 2D vectors."
Student: "Yes, but if you look at them side by side and let your eyes go kind of fuzzy..."
Teacher: "Whoa! I see it!"