Jonathan Gold writes that the Yogācāra thinker Vasubandhu can be said to be an idealist (similar to Kant), in the sense that for him, everything in experience as well as its causal support is mental, and thus he gives causal priority to the mental. At the same time however, this is only in the conventional realm, since "mind" is just another concept and true reality for Vasubandhu is ineffable, "an inconceivable “thusness” ("tathatā")." Indeed, the "Vimśatikā" states that the very idea of "vijñapti-mātra" must "also" be understood to be itself a self-less construction and thus "vijñapti-mātra" is not the ultimate truth ("paramārtha-satya") in Yogācāra. Thus according to Gold, while Vasubandhu's "vijñapti-mātra" can be said to be a “conventionalist idealism”, it is to be seen as unique and different from Western forms, especially Hegelian Absolute Idealism.