Right after I activated this option, it felt like I was using the Force to control the phone, but then the camera started mis-reading a flick of my eyes as a signal to scroll up or down, which I then found myself correcting with a tap of a finger. The touchscreen (which can be used while wearing some gloves) doesn't look obsolete yet.
The touchscreen you don't have to touch: Or maybe it is! Another S 4 feature, "Air view," detects when your finger is just above its 5-inch screen to provide previews of content. This looks like serious magic, except that it only works in compatible apps - such as the proprietary calendar app Samsung shipped to replace the simpler program that comes with Android.
The time-and-space-warping camera: The picture-taking tricks in the S 4′s camera let you pull off stunts like embedding a real-time self-portrait in a photo and generating a time-lapse photo of a moving person. But it's surprisingly hard to keep your face properly framed and exposed in the front camera while also getting a decent photo of the primary subject with the back camera. And that second, "drama" mode exhibits too much drama of its own - it kept complaining that the subject was too far away, too close, or not active enough.