Elysia

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"Elysia" appears in two Stevens' poems: "Extracts from Addresses to the Academy of Fine Ideas" and "The Pure Good of Theory."
In "Extracts," a poem moving through ideas about the artificiality of perception and its consequences, Elysia signifies our common everyday experience, a realm of consciousness that combines the real ("half earth") with our perceptions of the real ("half mind"). It is "the single place in which we are and stay,/ Except for the images we make of it...," suggesting that Elysia represents our conditioning in the real in combination with what we create out of it. For the speaker of the poem, this is an "unhappy" condition. Happiness, then, means satisfying the conditions of the mind alone--an idea that seems to call for the kind of 'fiction' Stevens evokes elsewhere.
In "The Pure Good of Theory" Elysia is where "Adam" is from, suggesting a pre-Christian or pagan resonance, but the reiteration of the common condition of Elysian awareness is made clear in that Adam works in this poem as the maker of "metaphor" from the most primal state of realness (naming the animals, for example). Man does not live solely in the real but constantly makes language and thought out of life, a process which threatens to disconnect him from fundamental reality.
Likewise, there is a flavor of Elysia in Elysium, or the Elysian Fields, which is a Greek mythological conception of a part of Hades where heroes and those favored by the gods get to enjoy the afterlife in pleasure and indulgence.