 The antirealist position, held by Sakya Pandita and his epigones, insists on the radical distinction between the conceptual domain and reality, between universals and particulars. Only particulars are real—the criterion for reality being causal efficiency. Universals are mere mental constructions; they are superimpositions that do not reflect reality, but veil the individuality of particulars under the cover of an imagined shared property. Conversely, the distinct properties that one ascribes to a particular are equally not part of the fabric of reality, but mental constructions that veil the unity of that particular.