Wow! The folks over at Boys and Girls have really outdone themselves with this! A desk held steady by giant Jenga blocks and balloons? - I want one! Here's the scoop on how it was done:
"A new type of rubber composite was used to make balloons that were genuinely air-tight and would never degrade, and Caltech were called upon to supply a Heluim/Hydrogen hybrid gas with an atomic weight 150 times lighter than Helium alone.
Ribbons reinforced with Carbo-Titanium (and in pretty colours) were used to secure the table top to the balloons, tied off on an aerospace grade titanium cleat.
Finally, giant Jenga blocks were carved from solid wood and placed on the reinforced floor."(Source)