Nalo Hopkinson's 'Tan Tan and the Rolling Calf' is interesting as a sci-fi because it takes advanced technology and merges it with Caribbean mythology and vernacular. It makes you as a reader question why sci-fi (and fantasy while we are at it) are so focused in on white cultures and languages, particularly when the very genre is one that anything can happen.
The most notable part of 'Tan Tan' is the use of a writing style and voice that doesn't fit the 'grammatically correct' way of writing and talking that white English speaking scholars have invented and enforced.
Another notable aspect is the fact that the religious aspects and the technology and town and planet names are all based on Caribbean or other black cultures. For instance, the planet (or dimension?) that Tan Tan is originally from is named after the leader of the Haitian revolution, Toussaint Louverture. And the planet they are currently exiled to, New Half-Way Tree is named after a town in Jamaica. Often the character call out to gods such as Anansi (with Tan Tan in particular feeling a strong affinity to him), and the creature Tan Tan adopts is named a rolling calf, which is a creature from Jamaican folklore.
Just the process of making the main character and the culture non-white, non-western pushes against the majoritarian culture. The story itself isn't one that is too out side the box of mainstream sci-fi, and its a pretty easy to follow an cookie-cutter story (even has a happy ending!), but it's the world-building decisions that make the story stand out. Like with 'Attack the Block'— which is just a story of kids on their bikes fighting monsters, one we've seen dozens of times— but choosing to set it up in a low-income housing black and to make the kids part of that world (and predominately non-white) made the story something unique and ground breaking. Because the culture you grow up in effects your responses to events around you and to the morals that will be brought forward from those events.