Every season is a season of change. Each has its own distinctive sights, sounds, scents.
Autumn, of course, has changing colors as the leaves of deciduous trees and shrubs turn color and fall to the ground. It has the sound of migrating geese passing overhead and the scent of dead vegetable matter slowly turning into compost or, sometimes, of the leaves being burned. One of my neighbors was burning leaves this week. While it is not a good use of Nature's gifts, I have to admit that it presents a lovely scent.
Richard Wilbur wrote about the beautiful changes in Nature and the changes in the "valleys" of our own minds.