On Tue, 06 Aug 2013 20:51:11 -0400, Jim Elbrecht
wrote:

On a kitchen wall I want to put some shelves- 4" or so deep-

The space is about 48" wide & high-- and I want to put 3 vertical
strips but keep them hidden-- and I'd like to be able to slide the
shelves horizontally.

Something like this-- but with floating shelves;
http://www.homedecorators.com/P/Stan...lay_Shelf/210/

Should I just build each shelf-- or is there some hardware that will
get me there easily?


These are nice, but expensive. Can't see how the thickness adjustment
works, but maybe if you get it right you can slide the shelves.
http://tinyurl.com/mxvyago
Very unobtrusive. Just seem expensive to me.
These cut the cost in half.
http://tinyurl.com/mqqmxmz

No personal knowledge about how good these are, but is you're looking
for low profile, they fit the bill.
If you want vertical adjustment, you'd have to add them to where you
want the shelf location to adjust to. Wouldn't be as "adjustable" as
the typical rails/brackets system, but easier to hide these than
rails.
Otherwise, a typical rail system. But most I've seen are for wider
shelves.
Here's a 4"
http://www.thehardwarehut.com/catalo...hp?p_ref=37082