Here's how I know it's Autumn: Acorns all in a row (to help out the squirrels), and constant questions about how they store food for the winter.
Piles left everywhere, of fall leaves, cool sticks and buckeyes. Questions about why leaves change colors and random ones about whether this stick or that is a good length for Yoda to use.
I love it all and wouldn't trade it for the world.
I'm sure I collected things as a child, but for the life of me, can't really remember what.
How about you?