How to shelve 3 sides of an alcove without brackets

[MisterBoy]

I have a deep alcove with all 3 sides about 1.2m long and I am going to shelve each wall. Using brackets this is easy but I would love to do it as fitted shelves.

If it were simply across the alcove then I could fit boards vertically on each side and use those little pegs, so the shelves are supported at each end virtually invisibly.
But with shelves on both walls coming into the corner, I can't see how I'd do anything like that as one wall will 'block' the other.

If I made that clear, is there an obvious way to approach this?

 

[foxhole]

Sorry no idea what you problem is.

 

[MisterBoy]

Something a bit like this:

At the ends you have vertical boards for the shelves to hang off. How are they supported at the corner?

 

[Harry Bloomfield]

There appears to be some sort of support, in the back corner.

 

[foxhole]

That’s not alcove shelving , it’s a built in unit.

 

[Why Not Indeed]

Helpfully, the person who took that picture has written a page about it and done a video:
https://woodwork.cooperjason.com/built-in-corner-bookshelf-with-open-corner-diy/
I haven't bothered to read the page or watch the video, but the chances are that's the kind of thing that would be explained therein.

 

[Deleted member 174758]

If the shelves are supported on a battens under their full length, or alternatively are installed onto the back panel by fixing through (I.e. screwing through the backs into the shelves), that gives you a lot of the strength. The corner is butt jointed and the shelves are joined in the corner using Dominos, biscuits or loose tenons (all of which give you a bit of "shimmy room") or alternatively are held together with steel repair plates on the underside. Done properly there is no need for a vertical support in the back corner. As someone said, it ain't rocket science