Pandora's box in reverse

Say you had a box. 2 cubic feet. Accessible to anyone in your community.

Everyday you can put something in the box and everyday someone will take that something out of it.

It could be anything: A book, a note, a poem. A usb full of videos. A mixtape. Photographs. Original art. A letter. A post like this one. A link to a product or a person or an idea you think might be of benefit. Advice you might give to your former self.

Completely anonymous. No link back to you.

Just a box, of possibility. A receptacle of insight. The perennial opportunity to create something or share something that might make a difference.

A recurring chance to change someone's posture or point of view.

If you had a box like that (you do), what would you put in it?