TreeHugger has shown many ways to hide the bed; most are designed to gain more space. But the Red Nest by Paul Coudamay doesn't; the bed is still there taking up space, but is hidden by the sliding bookcase.
MICRO HOUSE WITH SKY LOFT. While it looks like a greenhouse, this coastal home in California, built by Mickey Muennig, has a removable window which helps keep the place cool. Would be cool as a smaller version for the backyard!