" Heade’s calm is unsteady, storm-stirred; we respond in our era to its hint of the nervous and the fearful. His weather is interior weather, in a sense, and he perhaps was, if far from the first to portray a modern mood, an ambivalent mood tinged with dread and yet imbued with a certain lightness.The mood could even be said to be religious: not an aggressive preachment of God’s grandeur but a kind of Zen poise and acceptance, represented by the small sedentary or plodding foreground figures that appear uncannily at peace as the clouds blacken and the lightning flashes. "

― John Updike , Still Looking: Essays on American Art