The pieces look like they retain the shapes I cut them in when stacked. I started cutting them as pie slices, but then tried a few as parallel chops, and they get stacked in those shapes.

Also interesting is the shadows of leaves that stay consistent on the scene as the pile grows, but they don't appear on the splitting area itself.

Lots of engine noise too, I guess that's the ambience in this person's back yard! Probably true for lots of us.