In the Republic, poetry is condemned and the poets exiled just because poetry is a successful “imitation.” Imitation is bad for two reasons. For one thing, it is secondary, derived, not the real thing. In that sense it is factitious, however accurate it may be as a copy. A bed, for example, Plato argued, is already an imitation of the “idea” of a bed, the ideal paradigm from which each real bed is copied. A painting of a bed or a description of it in poetry, such as Homer’s description in the Odyssey of Odysseus’s nuptial bed, with its bedpost made of a still-rooted olive tree’s trunk, is at two removes. It is a copy of a copy, so who needs it?
is here "remove" as a noun.and mean: the distance between bedposts? but I don't understand "at two" here.
This passage is from a book named: On literature
This context is about Plato's opinion about poetry.
Correct me if I am wrong.