My heart goes out to Gus, the famously neurotic polar bear in the Central Park Zoo, who used to swim endless laps around his pool. He’d dive to the bottom in a froth of bubbles, surge across and then surface like a bear obsessed.
He’d backstroke to the other side, and with great paws splashing, dive down to the bottom and circle around again. Some wags called him the “bipolar bear,” but most zoo-goers sensed that he felt bored, pent-up, out of his element and depressed.