On close inspection it is just as topologically pleasing as it looks at first glance: There is only one shelf. Simon, it does run on both sides of the structure. It runs on the first and third rows*, up a coil, then on the second and fourth rows, and up the other coil back to the beginning of the path.

*regardless of how you number the rows, but I chose top-down and traced the shelf left-right on the closest part for it to go "up" at the coils.

This reminds me of a Michael Crichton novel.

What an interesting way to do both marketing and market research.

I'd choose JLr7.