"That's impossible," said Tris. "Most things are," Luca said, "if you think about them for long enough." - Jon Courtenay Grimwood

Why would we do this? she asked, watching smoke trickle towards the ceiling. A whole world of rigid rules covering temperature, convection and Brownian motion all busily pretending to be truly chaotic.

The third nightfall was less impressive than the second, which mirrored a rule Tris had already identified; new emotions devalued, going from intense through familiar to reach a kind of ghost state where one no longer really noticed them at all.

The fifty-third Chuang Tzu wore the very first on his cloak as a diamond buckle. Every emperor became a diamond eventually. It was one of the few advantages of living as a carbon-based life form.