Here's the way the piece works:
It starts out with Manet's famous painting on a video screen.
When people approach the work, they trigger sensors in the work. That causes the barmaid in the painting to morph into what appears to be a living, breathing woman (actually, a model who was selected and costumed to suggest the woman in Manet's painting.)
The morphed barmaid moves around behind the bar, sometimes yawns, sometimes leaves her place behind the bar. All of these activities are prompted by the movement and positioning of the viewers which are picked up by the sensors in the work.