• The clash of opposites;
• War ending, spherical, time stopping (and, thus, travelling), stasis fields;
• The archetypical mind-machine interface/melding;
• Holograms of loves lost;
• Tiny video-cameras that are spread in the wilderness, clinging to any species that moves, allowing for unmatched surveillance capabilities;
• Progress "stopped" (an oxymoron?) by edict;
• An unlikely (as they are) anti-hero;
• War as peace and peace as war;
• Technology (and the lack of it) and ingenuity;
• Artificial intelligence;
• ...
Oh! And the genious of Vernor Vinge, of course!