Again, to use Elle's example, Ca va? as a question meaning 'comment ca va?' is common, but both questions are in everyday usage - It depends on one's own way of speaking and to whom the question is addressed. I would never have said just 'ca va?' to my boss!
Hi, Pigale!
Thank you for endorsing my explanation of " son et lumiere".
I have seen pictures but have never been to an event.
I am told it is very beautiful!
And of course, the music must add to the mystique.