Responsive Text Size Based On Face Detection
This is completely experimental in my opinion. It is however a glimpse into the future. Imagine font size on your screen changes as you move towards or away from the screen. This is what Marko Dugonjić is working on.
Source: Web Monkey
There is a demo page you can visit. It does uses your webcam to work, so you have to grant it permission to use your webcam. With mobile phones and tablets starting to have front camera, this might become the norm someday.