Necessity is the mother of invention. Space is at such a premium in Japan that they'll build extremely narrow buildings to fit into rectangular slices of lots. Although the spaces are long and thin, they can still be ergonomically designed so as not to be confining. At least that's what they claim, some of them look sufficating to me.
Above are some examples, with more at the Web Urbanist's post Narrower Towers: 20 of Japan's Thinnest Buildings.
