The entailment 'e is a sensing of a red and square sense-datum' entails 'e is a sensing of a red sense-datum' follows clearly from the actual structure of the sense-datum.

Now notice that there are many entailment relations between qualia-statements—for example, ‘\(e\) has \(Q_{Rx \amp Sq(x)}\)’ entails ‘\(e\) has \(Q_{Rx}\)’, and ‘\(e\) has \(Q_{Rx \amp Tr(x) \amp By \amp Sq(y)}\)’ entails ‘\(e\) has \(Q_{Rx \amp Sq(y)}\)’, and so on. The orthodox representationalist and the sense-datum theorist have simple accounts of these entailments in terms of the structure of the objects of experiences (apparent structure, for the representationalist; actual structure, for