This paper is the forerunner of an extensive logical analysis of the relativity idea, in which an axiomatic structure based upon the principles of topology is developed. It is meant to expose the manner in which relativity stretches from the pole of pure conception to that of factual observation, from the a priori to the a posteriori. We take pains to show, in connection with special relativity, precisely which elements are postulational and which are verifiable empirically. Our attempt can be (...) somewhat naively characterized as an effort to show how misguided it is to "derive" relativity from such experimental facts as the Michelson-Morley experiment--as so many textbooks profess to do. (shrink)