  It did not take Moore long to realise that the realist position he had advanced in ‘The Refutation of Idealism’ was too ‘na•ve’ to be tenable; he had to be able to accommodate ‘false’ appearances somehow. But the strategy Moore adopted to deal with this remained true to the basic thesis of ‘The Refutation of Idealism’ that one should account for the appearances of things in terms of the properties of the primary objects of experience, and not the qualities of experiences themselves. To elaborate this position Moore introduced the term ‘sense-datum’ to describe these primary objects of experience: