Ever walk on tiptoes?
That's basically what she's doing in that pic, only she can rest her heel against that thin sliver on the back of the shoe for balance. All of her weight would be on the balls of her feet, and almost none at all on her heels.

I would think that those shoes are meant to be seen as you walk or stand for a few moments between long spells of sitting.
( The Resident Loon Not a demographic. Do not measure., Mon 13 Apr 2009, 20:50, Reply)