I didn't see any ballet.
That set was something of an optical illusion. I thought it was a painted stage curtain at first. Then a door opened and Violetta walked out onto what looked like a steeply curved floor and my jaw dropped. I loved it...for the rest of the first act. But I was thoroughly sick of it by the end of the opera. The only variation was those flowery throws in the second act, and they were just messy on that pristine set. But the opera sounded great even if it didn't look right.