Couldn't find an image of a system with corner section,
through a quick google search-- does this imply that they're 'undesirable', or merely rare? Do you know for sure that such a thing exists?
I don't see why a corner section would be difficult to install, but I could see how it would be difficult to display & store objects effectively on a corner section-- books, for instance, would be difficult to organize effectively in a corner.
I don't know how other people use their Cado systems, but mine are dedicated almost exclusively to books.
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