My job as a performer is to make sure that whatever happens in a performance lives in somebody else, that it's memorable... If you forget tomorrow what you heard yesterday, there's really not much point in you having been there - or me, for that matter.
Other quotes by Yo-Yo Ma
Sound is ephemeral, fleeting, but some sort of a physical manifestation can help you hold on to it longer in time. I'm sure of this; I've always thought the sound that you make is just the tip of the iceberg, like the person that you see physically is just the tip of the iceberg as well.
There are limits to how much sound a cello can make. That's part of the framing of acoustical instruments. Finding what those limits might be, and then trying to suggest perhaps even the illusion of going beyond is part of that kind of effort.