Hold Everything's Studio Spine Bookcase:
This is a budget take on the Sapien Bookcase by Bruno Rainaldi sold at Design Within Reach but I actually like it better than the original. It's a nice, medium height of about 5' 9" (the Sapien models are either too short — 5 feet— or too tall— nearly 7 feet). And it's available in white, which means it really would blend into the wall.
We have a big empty corner (where the rats' cage was before they died) that would be nicely filled with art books on this shelf.