In such a world, your digital life and your real life could overlap seamlessly. We see hints of this world in today's technology. There are hundreds of smartphone applications that add a digital layer over our perception of the real world. They might help you navigate around a strange city or discover a new favorite restaurant tucked away in a corner somewhere. These applications still require us to activate programs on mobile devices and use those devices as a lens through which we can see the digital world. In the future, we may be able to accomplish the same thing using glasses, contact lenses or perhaps even ocular implants. Imagine being able to look at the world through one of a million different filters, all of which provide different kinds of information to you instantaneously.