In "Winter Saturday," a (presumed) family has been cooped up for a while in their farmhouse following a snowstorm and is looking for an escape to something a little more exciting. One theme emerges: the creations of mankind will always disappoint when compared to the awe-inspiring hand of nature.
The people, themselves a creation of nature, are likened to caterpillars, emerging from the wood of their farmhouse all furred-up in winter clothing. They head for their "coccoon"—a Ford—to take them to town. They have "dreams" of light and sound, which is important to note.
This idea of having something more to entertain them is a fantasy: an illusion. As they travel, they "glide unamazed through snow" which has been "marbled and fluted" by the wind. Beauty and wonder surrounds them on this journey, but their dreams of man-made entertainment pulls them forward through the snow; they remain blind to the natural miracles. Continuing the comparison to a caterpillar, the people "hatch" from their car and "flutter" toward entertainment. However, in the end, the evening is a disappointment as "the town was less than its glow." And so they return to their farmhouse, lonely and drowsy.
The poem shows that people who cannot appreciate the novelties that nature provides will never be content with the creations of man.