We live in the future that we used to read about: our smartphones bear more resemblance to The Hitch-hikers’ Guide to the Galaxy than to Bell’s telephone and there are people living on a space station above our heads. When I first read about helicopters and submarines in Jules Verne at the age of twelve, they were already reality; it was then difficult to grasp that to the author all this had been a fictional future. Good for Verne. There are plenty of contrary examples: books in which the authors were so wildly off the mark that we can only wonder at what they were thinking. Science-fiction? In many cases, the word science ought to be crossed off.
But not in the case of 2001: A Space Odyssey.