“When a captive lion steps out of his cage, he comes into a wider world than the lion who has known only the wilds. While he was in captivity, there were only two worlds for him - the world of the cage, and the world outside the cage. Now he is free. He roars. He attacks people. He eats them. Yet he is not satisfied, for there is no third world that is neither the world of the cage nor the world outside the cage.”

“He who is conceived in a cage yearns for the cage.”

“[Selden] had preserved a certain social detachment, a happy air of viewing the show objectively, of having points of contact outside the great gilt cage in which they were all huddled for the mob to gape at. How alluring the world outside the cage appeared to Lily, as she heard its door clang on her! In reality, as she knew, the door never clanged: it stood always open; but most of the captives were like flies in a bottle, and having once flown in, could never regain their freedom. It was Selden's distinction that he had never forgotten the way out.”

“A world without huge regions of total wilderness would be a cage; a world without lions and tigers and vultures and snakes and elk and bison would be - will be - a human zoo. A high-tech slum.”

“The world was becoming a zoo, without cages.”

“How the world so dearly loves a cage.”