Ressonate means to oscillate. As when you have something bendy and springy and wave it about so that it wobbles backwards and forwards.
A property of things that resonate is that when you give them a shove, something to get them started, they keep oscilating, perhaps even growing in amount.
Two similar thungs close together may get each other started resonating.
Here to resonate is the same concept. The art, creates more emotion in people who identify with it; it resonates with them, setting up things in them.
So reflect, is part of it, as this is part of creating the emotion.