The magic of rotting. Of composting.
Billions, maybe zillions, of micro-organisms, including bacteria and fungi, are settling in and starting to do their thing by munching through all the plant debris and turning it into something that plants can use next year for their nourishment.
They are joined by legions of other creatures including insects and worms who help by breaking up the bigger pieces.
It is magical what happens to all those leaves and blades of grass over the winter. Magical. By spring, they will be mostly composted. Not completely composted, but enough to add organic matter to the soil, enriching it for next year's crops.
I am looking forward now to that first day of spring.