I posted a photo in the gallery, but I'll describe it here too since images don't always load for folks.
It's a tonogodhime stack: alternating pairs of logs at right angles, making a square log-cabin-like stack.
Each layer is basically two logs side-by-side, and the next layer rotates 90 degrees and sits across them.
No frame, no wire, nothing holding it except the weight and the alternating directions.
Photo shows a 3-layer square stack on bare soil under a maple, with mushroom tags on the end grain.
I kept it low because I'm still figuring out my spacing. It feels surprisingly solid.