New way of doing box joints without vertical

A more typical obsession is to want to hide endgrain — as more than one woodworker has opined:

Endgrain is like a belly button, you know everyone has one, but it’s pretty rare that you want to see one.

To me, this is an interesting example of how we are starved for anything genuine and truly well-made, for quality goods in general, so we fetishize things which exemplify quality, e.g., highly polished brass fittings which once upon a time were allowed to tarnish so as to fade into the background.

If you want to do box joints (or dovetails), it’s pretty simple to just make a vertical fixture:

and then cut traditional joints:

or see: