YOUR correspondent stands, in a pleasingly impossible way, in orbit. The Earth is spread out beneath. A turn of the head reveals the blackness of deep space behind and above. In front is a table full of toys and brightly coloured building blocks, all of which are resolutely refusing to float away—for, despite his being in orbit, gravity’s pull does not seem to have vanished.

http://www.economist.com/news/science-and-technology/21662481-virtual-reality-flopped-1990s-time-its-differentapparently-grand