The HoloLens is essentially a computer you wear on your face. But instead of interacting through a keyboard, mouse, or touchscreen, the HoloLens projects 3-D images in front of you that you can reach out and touch. And based on the demos we've seen so far, it looks really cool.

Microsoft is far from being the first big tech company to explore the idea of computers that we wear in front of our eyes. Google unveiled Google Glass back in 2012 — a head-mounted computer that's a lot smaller than HoloLens and doesn't project images in 3-D.

But the device never really took off, and Google has yet to officially release a version of the gadget for everyday consumers. Now, reports suggest that Google is pivoting Glass to focus solely on enterprise and industrial-use cases, rather than as a cool gadget for adventurous early adopters.