 Another, related, reason is that Husserl’s argument for realism is developed in a context in which he defends what he refers to as “transcendental idealism” (a terminological choice he would later regret; see Føllesdal 1990a, p. 128). During the years in which his transcendental phenomenology took shape, he developed a number of “proofs” of this position, most of which are based upon his conception of a “real possibility” regarding cognition or the acquisition of knowledge. By a “real possibility”, Husserl understands a possibility that is such that “something—more or less— ‘speaks in favour of it’” (Husserliana, vol. XX/1, p. 178). Real possibilities are, in other words, conceived of as more or less (rationally) motivated possibilities; and Husserl understands motivation in such a way that it is always someone who is motivated a certain way (cf. Husserliana, vol. IV, p. 222). This is why Husserl subscribes to the following dependency thesis: The real possibility to acquire (empirical) knowledge regarding a contingent object A (possible world, individual thing, state of affairs involving such thing; cf. Husserliana, vol. XXXVI, pp. 139f) “requires” an “epistemic subject”, which “either experiences A, or acquires knowledge regarding A on the basis of experience, or else has the practical possibility (or the practical ability) to experience A and acquire knowledge regarding it” (Husserliana, vol. XXXVI, p. 139). Husserl also adheres to the following correlation thesis with regard to empirical reality and real epistemic possibility: If a contingent object A is real (really exists), then the real (as opposed to the merely logical) possibility obtains to acquire knowledge regarding A (cf. Husserliana, vol. XXXVI, p. 138, l. 35–36). From these two propositions—the dependency and the correlation thesis—he derives the conclusion that the existence of a contingent object A requires “the necessary co-existence of a subject either acquiring knowledge” regarding A “or having the ability to do so” (Husserliana, vol. XXXVI, pp. 139f). This is nothing but “[t]he thesis of transcendental idealism [...]: A nature without co-existing subjects of possible experience regarding it is unthinkable; possible subjects of experience are not enough” (Husserliana, vol. XXXVI, p. 156).