In her review of Cinderella, Ana Abad-Carles refers to a step performed by Shipulina that the other Cinderellas never attempted:
In the variation of the second act, Shipulina performed a series of glides on her point shoes (in demi-point) that were simply gorgeous to watch and gave the character a especial quality of daringness and lightness.
Sadly I didn't see Shipulina in the role myself, but Ana wasn't the only ballet goer impressed this step and a number of people were discussing it. I recently discovered this clip on You Tube and now we can all see what it looked like.
Is it newly invented, or has someone seen something similar before?