 This particular theoretical allegiance that drives some epistemologists to posit sensations understood in the technical sense of sense-data has as its source the idea that there are two kinds of space, which we know today, thanks to Sellars, as the space of reason and the space of natural law. In the first, the notion of inference, evidence, premises, evidence, and conclusions have their home; in the other is the raw “data” understood in the sense of that which is given or accepted without argument.