More than half of the world population lives in metropolitan areas. By 2050, this number is expected to increase by 66 percent, with an additional 2.5 billion humans inhabiting worldwide cites, according to a report by the United Nations. This is a daunting prospect, considering cities are already rather densely populated with little wiggle room for further expansion.

Fortunately, many architecture and design firms are working to intelligently maximize existing living space to get the most functionality out of even the most modest studios. From sliding walls to murphy beds, there are a slew of creative ways to efficiently utilize our current living spaces and these six transforming homes are as ingenious as they are breathtaking.

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