While "Musion 3D" is a cool as hell effect without a doubt, it is NOT holographic nor is it 3D and they should not be allowed to bill it as such. Holography is a very specific technology and art form, yet people use it to describe cool optical trick from Pepper's Ghost to parallax barrier or lenticular autostereo displays. A hologram actually records the positions of photons of light, hence their ability to reproduce 3D images. Holograms are the only "real" 3D we see other than our normal vision. Stereoscopic 3D movies are merely an illusion of 3D created by the two carefully recorded and presented independent 2D views our brains interpret as 3D. The Madonna walking in front of and then behind Gorillaz cartoon bassist Murdoc was achieved far more simply than you might imagine. The first part of Madonna's performance was also virtual. After the Madonna / Gorillaz projections left, the real Madonna took the stage. Excellent illusion, impeccable staging, technically perfect, but not a hologram and not 3D.