Bracing for a Fall

It seems like every year there comes a time in late summer where autumn is all of a sudden in the air. To me it's not a matter of temperature so much as a change in the sky--all of a sudden the light seems to be somehow filtered, even on a warm day. The past few days have been like that despite being really clear and warm, which means cooler weather is probably just around the corner (cooler, that is, than the strange cold spell we had in August)...