Spiral is probably not the best word, sorry. Let me try to explain it another way. (It would be so much easier with a picture!)

So a dovetail joint has two pieces that slide together at the corner. Because of how the wood is cut, one side of the corner has a fancy zig-zag showing on the outside (tails) and the other just has boring parallel lines (pins). [0] You have to slide the piece with pins into the piece with tails.

So typically if you're making a dovetail box, each side of the box would either have pins on both ends or tails on both ends. This is so that the last piece has both joints pointed the same direction so both ends can slide in to the rest of the box.

You end up with two sides of the box showing the zig-zag tails and two sides showing the boring pins. [1]

But I figured out how to assemble the box so that each side showed tails at one end and pins at the other.

[0] https://technologystudent.com/joints/dovejts.htm

[1] https://blendswap.com/static/blendImages/2021/7/31/Blend/286...

Edit: another way to describe it is that I made a square frame that had rotational symmetry instead of horizontal and vertical symmetry.