What color is the dress of the fourth Kimbra?
Is she staring at you?
What is the thing in the middle of the 3D scene? Is it a ring or a penny?
Are the pictures in the background hanging on a wall or scattered over the stage?
No special glasses are needed to answer these questions. All you need is TWO eyes in working condition and a little visual training...
This is an autostereogram designed for divergent (wall-eyed) viewing. One way to help the brain concentrate on divergence instead of focusing is to hold the picture in front of the face, with the nose touching the picture, then slowly pull back the picture away from the face, while refraining from focusing or rotating eyes. At some point rings, coins, Kimbras... will just pop out of the receeding background !
All the imagery comes from Kimbra's "Good Intent" music video.
More about autostereograms here.
