It is just for fun and it is not that complicated. You just need to delete the sphere above and duplicate the plane, move it up alittle and put something in between. Align a camera to the plane, adjust its clipping start, delete the area lamp, add a hdri. Set appropiate values in the light paths, in cycles. Hint: You can check out CGCookie instructor Kenny Phases youtube channel, he has a nice example of this there.
