 Systematic ambiguity affects not only single words and complex expressions. It affects grammatical constructions as well. Since expressions of the same grammatical constructions function to express thoughts of multifarious logical sorts, those starting to philosophise (those operating upon ideas and not merely with them) “tend to be blind to the fact that different ideas have different logical powers…” (1945, 200). Assimilation of the functions or uses can lead to trouble, and this can be shown by eliciting contradictions, absurdities, and paradoxes. To return to where we began: