Discs, Just no Desert Island

I think it should be noted for clarity that I am not on a desert island; I am in my office, in the North East of England. And it is raining outside.

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Perspective is an odd thing. Imagine a shape. From one point of view it is a triangle; from another it is a circle. Two people seeing this shape would fight to the death to defend the view that the other person cannot be right.