Ringworld
Niven's 1970 novel sends an expedition to a million-mile-wide ring orbiting a distant star. Hard SF world-building at its most audacious. MIT students famously pointed out engineering flaws at a convention; Niven wrote a sequel to fix them.
Readers find it ironic that a book selling a giant visual structure describes it so vaguely, “so poorly described, I defy anyone to picture it.” “Louis Wu is two hundred years old, which has no consequence,” no wisdom and no changed perspective, a stand-in adventurer. The treatment of women is the heated complaint, “the female characters are sadly one-dimensional,” passive, sexually available on demand, defined by usefulness to men; One reader writes the cast off as “dumber than a box of rocks,” and Teela Brown’s inherited luck draws science objections independent of that. And the middle is talky enough that readers say nothing happens.
The case for it and the rest of the canon open with Pro.
