  However, the meaninglessness view also faces several serious challenges. First, note that some of the observations raised against the syntactic approach (§3.1) also pose a problem for the meaninglessness view. For example, consider the context sensitivity of category mistakes. Since in some contexts ‘The thing I am thinking about is green’ is entirely innocuous the sentence is clearly meaningful. But as with being syntactically well-formed, being meaningful is a context invariant property of a sentence so the sentence must be meaningful even in those contexts where the thing I am thinking of is the number two.