  Another option (or class of options) that is available is to claim that attributes come in pairs: an object-like attribute coupled with a thought-like attribute (Curley entertains this option as well; Curley, 1969, 146). Under this type of interpretation we would get Thought and Extension following the structure of the first alternative, that is, each idea in Thought is associated with (one and the same) a mode in Extension. Taking there to be more than just two attributes, we also get Thoughtx coupled with Extensionx in which each ideax is one and the same as bodyx under Extensionx, and Thoughty coupled with Extensiony, and so on. Letter 66 provides some support for this view. This kind of account has to be supplemented, of course, with an account of the relations among these Thought-like / Extension-like pairs of attributes.