What is Le Cirque de Reves?

Le Cirque de Reves is a mysterious circus that only opens at night. It is completely monochromatic in design, featuring only black, white and greys in its color scheme, with towering tents of varying shapes and sizes, an elaborate wrought-iron fence, and a black sign painted in white letters that reads "Opens at Nightfall, Closes at Dawn" (p. 4).