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You can only measure the relative speed of one futon to the other if you're on the other futon; if you measure the speeds from a third point that is stationary relative to both futons you'll find that they are both travelling at 'c'. Regardless if which futon you're on, you'll also measure the speed of the other futon as 'c'; time dilation and length contraction make it all work out to give the same answers.Why futons, and not just chairs or sofas?