Day and night

Day and night do not exist. Weeks and months do not exist. Only time exists, time marching ever onward for the people of New Giraffe City. They have been that way for as long as they can remember, for as long as time itself can remember. The vast towering City above, the vast Garden below, between them, the Library - the store of humanity's information and the Arc - genetic samples of all the ancient mammals from Aardvark to Giraffe. The actual classifications are more complex, but in the interest of nostalgia, that's what the people of New Giraffe City like to say.