It is a Technology wonder.
It is called On-stage Telepresense which gives the participants, on stage experience while speaking to each other.It is a collaboration between cisco's Telepresence with Musion's 3D Holographic display technology which gives you a real-time virtual presentation.
Watch this video:
World’s first Live Holographic Video Feed from California, USA to Bangalore, India
I came to know this from Guy Kawasaki's blog at : http://www.blog.guykawasaki.com/
You can wonder why this post in a self development blog,but this is one of the example of how much humans can achieve by thinking creatively and out of the box.