Classical reserve

Do you think "reserve" in the following context means something like "serenity"?

Context:

For decades the art of painting had seesawed between expressionist impulses and classical reserve, between the rational and the irrational. In particular, cubism and surrealism presented two contrasting alternatives, one depending upon geometry and the grid, the other upon the looser form of dreams. Excavation was a magisterial synthesis of these two claims on modern truth. . . . de Kooning gave this synthesis a strongly American character. Excavation had none of the monkish reserve of Parisian cubism, but seemed brash and pulsing, like a blinking sign in New York. A black and white city that glinted with occasional color, New York was itself a kind of synthesis of
cubism and surrealism, a combination of strict grids and liberating gestures in which order and chaos, reserve and craziness, appeared locked in tense balance. . . . No other American painting . . . conveyed with comparable force the jazzy syncopation of the city. . . . Modern culture is often the study of fragments and lost wholes.