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The imagination loses vitality as it ceases to adhere to what is real. When it adheres to the unreal and intensifies what is unreal, while its first effect may be extraordinary, that effect is the maximum effect that it will ever have.

Wallace Stevens (2011). “The Necessary Angel: Essays on Reality and the Imagination”, p.6, Vintage
The imagination loses vitality as it ceases to adhere to what is real. When it adheres to the unreal and intensifies what is unreal, while its first effect may be extraordinary, that effect is the maximum effect that it