Sketch of an argument from

You are all, I trust, looking at the envelope I am holding up. Everybody see it? (Affirmative murmur from class.) Fine! Now you people to my left, notice that what you see is not strictly rectangular: it is trapezoidal. If you were an artist, you would draw what you see after this manner: (he draws trapezoid whose right, vertical side is longer than its left vertical side). (Murmur of approval for artistic talent.) Yet the people to my right will notice that what they see is not rectangular either; nor is it exactly like the trapezoid which I have just drawn. Rather, what you see is like this: (he draws a mirror image of the first figure, having a taller left vertical side and a shorter right vertical side)
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