Support ideas for a 8" wide shelf?

[MK]

I did Ikea book shelves for my wife a while back and I was absolutely stunned by the method they used to hold them up.   Pure connector in tension, no visible means of support.....
https://www.ikea.com/us/en/catalog/products/90282180/

Look through their stuff, it's widely available, and no where near as 'ugly' to put in a living space as a plywood shelf with steel brackets underneath.  I'm always just so impressed with their engineering and materials selection when you compare it to the typical chipboard furniture out of a big-box store.

Plus 1 on that!  Some of their more expensive stuff does not look like "IKEA Furniture" as all.

[OldEastRR]

Yes, I'm going to tie this shelf into the main layout frame so I'll go with the box structure, though it might be overkill support-wise. However be easier to disassemble and move if I ever move. Good ideas on supports -- I like the bookcase and IKEA braces ideas much better than building legs for the thing. No legs means no way of kicking them to cause an earthquake.