Genres are usually defined by their tropes—mysteries have murders and clues, romances have two people finding each other, etc. Science fiction doesn’t work well when you define it like that, …
Jo Walton on how reading SFnal works sometimes requires learning how to read such works.
Having a world unfold in one’s head is the fundamental SF experience. It’s a lot of what I read for. Delany has a long passage about how your brain expands while reading the sentence “The red sun is high, the blue low”—how it fills in doubled purple shadows on the planet of a binary star. I think it goes beyond that, beyond the physical into the delight of reading about people who come from other societies and have different expectations.
Because SF can’t take the world for granted, it’s had to develop techniques for doing it. There’s the simple infodump, which Neal Stephenson has raised to an artform in its own right. There are lots of forms of what I call incluing, scattering pieces of information seamlessly through the text to add up to a big picture. The reader has to remember them and connect them together. This is one of the things some people complain about as “too much hard work” and which I think is a high form of fun. SF is like a mystery where the world and the history of the world is what’s mysterious, and putting that all together in your mind is as interesting as the characters and the plot, if not more interesting. We talk about worldbuilding as something the writer does, but it’s also something the reader does, building the world from the clues. When you read that the clocks were striking thirteen, you think at first that something is terribly wrong before you work out that this is a world with twenty-four hour time—and something terribly wrong. Orwell economically sends a double signal with that.
Because there’s a lot of information to get across and you don’t want to stop the story more than you can help, we have techniques for doing it. We have signals for what you can take for granted, we have signals for what’s important. We’re used to seeing people’s names and placenames and product-names as information. We know what needs to be explained and what doesn’t. In exactly the same way as Trollope didn’t explain that a hansom cab was a horse-drawn vehicle for hire on the streets of London that would take you about the city but not out into the countryside, and Byatt doesn’t explain that the Northern Line is an underground railroad running north south through London and dug in the early twentieth century, SF characters casually hail pedicabs and ornithopters and tip when they get out.
Read the entire post for all of Walton’s insights.