Size: 330 sq. ft.

Location: Hong Kong

Gary Chang, an architect in Hong Kong, turned his family's tiny 330-square-foot tenement apartment into a sleek and efficient living space with 24 different room combinations, including bathrooms, kitchens, living rooms, and even a guest bedroom area.

So, how does he do it? Chang installed a number of sliding panels which he can move around the space to reveal hidden areas and storage. It's a system he calls the "Domestic Transformer."