Sentence:  We can combine all five metaphors into a single integrated <WSD>supermetaphor</WSD>. The theatre can be visualized as including useful aspects of the threshold, searchlight, iceberg, novelty, and executive notions. As such a <WSD>supermetaphor</WSD> becomes enriched, it can gradually take on the features of a genuine theory. 
Meaning of the word marked with <WSD> tags:  An overarching metaphor; a metaphor that encompasses several sub-metaphors.