a figure of speech in which a similarity between two things is highlighted by using a word to refer to something that it does not literally denote — as when Shakespeare wrote, "All the world's a stage."
When Shakespeare wrote, "All the world's a stage, And all the men and women merely players." he was not saying the world is really a stage and all people are actors. But he was pointing to the similarities he wants us to recognize.
No need for it to go all the way, good God, no , no need to overturn the rocking chair, to use Tom Twyford's metaphor.