Love this!

And even for something as simple as watching a YouTube video. When you look away from your device (let's say you need to avoid another pedestrian, or maybe a car!), it could pause the playback. Maybe followed by a "watch where you're going!" warning and the inability to use your phone again until you stop walking :)

Or, for the less intrusive mode, it might just resume playback when you look back at the screen :)

Control of devices via where you're looking is very exciting, and probably more so for those who have trouble interacting in a "traditional" way - like those with certain disabilities.

Great hunt!