Invisibility

The idea for a Harry Potteresque invisibility cloak has been around for a while, and the technology is finally catching up with the idea. Simple, really, cameras on one side display to the other side -- perfect camouflage as long as your tank is lined up properly.

I read a story, long ago, about a future world where people wore belts that projected the image of themselves they preferred to the world and hid their actual body within the image. You could present yourself as any height, any weight, any race -- you could appear to be an animal or a mythical beast or anything you can think of. People walked around hidden, no one knew who they really were or what they really looked like.

But nobody was invisible.