“Kids have a knack for hidden spaces. If there’s a half-filled closet, or a nook behind the stairs, or a cluster of bushes with a well-obscured clearing inside them, they’ll find it and make it theirs.
As a kid, my preferred hidden space was just outside my elementary school. Still technically on school property, so I wasn’t breaking any rules, but as far from any supervising teacher as you could get. It was blocked off on one side by the school’s brick wall and surrounded on all other sides by an overgrown bush. If you were small enough there was plenty room to move around and you could disappear completely.
My best friend at the time was as into ghosts and the supernatural as I was. I’d read more Goosebumps books than any of the boys in our class and she swore up and down she had a deck of tarot cards somewhere in her basement. We figured that made us experts on the occult. In our hidden space, we’d draw initials on the wall with white rocks, followed by dates like 1967, 1921, 1880, and pretend they were written by whole histories of kids who’d come here before. We didn’t have an Ouija board but we knew what one looked like. So we drew letters in the dirt with a stick and put a leaf for a planchette in the center. If the leaf was blown towards one of the letters by a gust of wind (or maybe by one of us exhaling a little harder than normal, by accident of course) it meant the spirits were trying to contact us.