 The round square inhabits a realm Meinong called Aussersein, and Findlay points out that sections of Aussersein can be grouped into compatible entities and consistent propositions (or facts) about them. These correspond, Findlay argues, to the different domains of different possible worlds (M: 58)) That different possible worlds can have different domains would become one of Findlay’s major complaints against Wittgenstein’s Tractatus and its fixed domain of ultimate objects. 