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Ursula K. Le Guin: The Left Hand of Darkness (Paperback, 2010, Ace Books)

On the planet Winter, there is no gender. The Gethenians can become male or female …

Light is the left hand of darkness and darkness the right hand of light. Two are one, life and death, lying together like lovers in kemmer, like hands joined together like the end and the way

The Left Hand of Darkness by  (Hainish Cycle, #4)