Air, like the Four Seasons and the other three elements, has been depicted in the form of a human head in profile. To express his ideas on the nature of air, Arcimboldo has populated this picture with a large number of birds. Most of them have only their heads visible and can hardly be identified, whereas others can be recognized immediately. The goose, for example, is quite easy to make out, and together with the tail feathers of a rooster gives a vague impression of an ear. The turkey with its swelled breast is the nose, and a pheasant, hiding partly under the wings of the rooster, provides a goatee beard with his tail feathers, thus decorating the chin of the figure. The little bird whose eye serves as the pupil of the human head remains a mystery, however, while the upper and lower eye-lid of the head is formed by the open beak of a duck. Arcimboldo's Four Elements contain some obvious references to the House of Hapsburg, such as the peacock and the eagle, which are both symbols of the dynasty.