The impossible joint

That was me that made the box and posted the pics.

 I'm still messing around with the joint and trying to come up with interesting variations.  For me woodworking is just a hobby and for some reason, to my wife's chagrin, I'm drawn to the challenging much more than the practical.

If you ever want to give the box a try, you put together two L shaped pieces and then slide them together at a 45 degree angle drawing the two completed corners in towards each other and the other two corners join together completing the box.

For anyone else wanting to give this joint a try, I have no secrets to keep and am happy to share.  To lay it out all I need is a sliding t-square set tightly at a moderate angle, a good sharp marking knife, a comfortable place to sit, and a bit of quiet time.  Make sure the t-square  won't slip or change angle as  you will use that t-square many times per joint.  I don't use math to set it to a magic angle.  I have no idea if my square was set to 7, 8, or 9 degrees.  I just do it by eye.  As far as the width of the pins or spacing between them, again I do it by eye.   Look carefully and you should be able to figure out how the angles intersect from the face of the joint on across the top.  Again, I use the same t-square set at the same angle all the way.  The hardest part is transferring the angle from one board to another.  Actually, it's not so much "hard" as very exacting.  The whole joint is really.  You must use the sliding t-square to lay the lines at a precisely consistent angle.  The cutting, as well, must be spot on.  I have not found any way to fudge or repair a mis-cut line.  If you lay out every line consistently and cut them each precisely the joint will work.