Steel cable tethers the top bed to the bottom base. Had to do some math to determine how long the cable needed with how high I calculated that the bed would float. I got this stabilization system (and most of the idea of the bed!) from this bed which is a much larger scale, much more expensive version.
The office was spookily furnished, since none of the furniture had legs. Everything was suspended magnetically at the proper height...
Update 17-Jun-2012: Thanks to Zac Hunter, we have cool sf precursor for this DIY bed from the 2007 novel Spook Country by William Gibson. See the entry for the magnetically levitating bed. End update.
See more pictures (and possibly enough pictures to create your own bed) here.
Scroll down for more stories in the same category. (Story submitted 5/27/2012)
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Sky City's 220 Stories Are Go
'It rested among green parklands and... stood in total isolation, a glittering block of whites and flashing windows dotted with colors.'
Robo-Raven Flapping Wing Robot Bird
'When he had first built them, they had been crude indeed, flying mechanisms with little more than a reflex-response unit.'