It's tantamount to pressing your face against the glass of a posh restaurant and helplessly slobbering down the pane while the punters inside scoff expensive steak.
These images show off the Sky Pool that will link two residential buildings at Embassy Gardens, Nine Elms. The 25m pool, designed by Arup Associates, will 'float' 10 storeys up — its transparency giving you the closest feeling you'll get to flying above London. (If you don't like heights, do backstroke, as shown above).
Right now, it's being constructed in the States. But even when it's ready, it's unlikely you'll be able to take a dip.
To get access to the pool, you'll need to own one of the properties here. Starting price: £650,000.
Don't chuck away that leisure centre membership just yet.