When we talk about about modernism or postmodernism, we are really talking about ways of thinking about the world. These ways of thinking tend to fall into particular themes like: what is real vs. what is a copy/simulation; or, what is true and what is not true,
and how to know the difference.

"In a world in which stylistic innovation is no longer possible, all that is left is to imitate dead styles, to speak through the masks and with the voices of the styles in the imaginary museum" (Fredric Jameson).