The Left Hand of Darkness by Ursula K. Le Guin (4 stars)

I can see how this was very groundbreaking in 1969. It is a well written thought experiment on gender and sex, and how it influences so much of society structure and behaviour. Amazingly it has stood the test of decades and much progression in our thinking about gender and sexuality to still be readable and relevant to the modern reader. There's plenty of old sci-fi that hasn't aged nearly as well, and shows it was definitely deserving of it's Hugo and Nebula awards.

We follow a human ambassdor's experience on the planet Winter where:

Cultural shock was nothing much compared to the biological shock I suffered as a human male among human beings who were, five-sixths of the time, hermaphroditic neuters.

Consider: There is no division of humanity into strong and weak halves, protective/protected, dominant/submissive, owner/chattel, active/passive. In fact the whole tendency to dualism that pervades human thinking may be found to be lessened, or changed, on Winter.

Le Guin leads us through many facets of the society and ambassador Genly's realisation of just how different this gender neutral world really is to a human male:

The First Mobile, if one is sent, must be warned that unless he is very self-assured, or senile, his pride will suffer. A man wants his virility regarded, a woman wants her femininity appreciated, however indirect and subtle the indications of regard and appreciation. On Winter they will not exist. One is respected and judged only as a human being. It is an appalling experience.

In addition to the gender thought experiment there's also plenty of other issues touched upon, including how damaging rabid nationalism can be.

If you're after a rollicking plot and scintillating adventure on another planet, this is not the book for you. It feels like reading a documentary about another planet, a super-interesting one, but the plot isn't the strongest part of the novel.

4 stars.