Standing-room

Each floor of the ark contained five thousand six hundred and one square yards, and the three floors sixteen thousand eight hundred and three square yards, the total standing-room of the ark. […] Let us not crowd Noah, but take the six thousand two hundred and sixty-six species of Lesson. Seven of each of these would give us forty-three thousand eight hundred and sixty-two birds, from the humming-bird, the little flying jewel, to the ostrich that fans the heated air of the desert, nearly three for every yard of standing-room in the ark.

Source: wiktionary

But also the time must be at hand when, if the population maintains its present rate of increase, standing-room on the globe will become a pressing problem.

Source: wiktionary

The detached gate leaning against the door in the picture shows how compactly it folds, and is the size usually used when mounted on the platform step, to increase standing-room on the platform.

Source: wiktionary