Years ago, I visited the zoo in Central Park in NYC and watched a polar bear, as it swam around and around in a pool. It swam in a triangle, touching the three same points on the wall of the enclosure as it made each circuit. Last month I walked around Greenwich Park in London 125 times, each time following exactly the same route. I thought about that polar bear a lot as I walked.
Not to take too dark a turn here, but human zoos were not uncommon at the turn of the century. The Bronx Zoo had people, in cages, on display in 1906. https://en.wikipedia.org/wiki/Human_zoo
While an infantorium still feels awful as a general concept, it did provide genuine medical care to very vulnerable babies. Eventually saving the lives of thousands of premature babies. The linked wikipedia article probably allows you to consider the morality more than my first paragraph ;)