Built-in solutions are cool for modern homes because they save space and look stylish: even if you have enough space, why not get some more? They also give you the chance to create your very own design that suits your space, style and specific needs.
I love the little semi-oval space the rail creates, bookcases, lighting, seating, rug and wood floor. A little library has been created out of "dead" space. This is just too good for words (Southern Living Idea House, Charleston).