The concept is roughly the same: by waving your hand left and right over the front-facing camera, you can answer calls and navigate through pics and music without touching the screen.

ENGADGET: Pantech Discover review: a budget phone has never looked so premium

After an embarrassing delay when Venus failed to appear at the precisely predicted time at the top-left hand edge of the Sun, someone noticed that Venus had in fact appeared at the bottom right-hand edge, resulting in a hasty re-adjustment of the camera.

ECONOMIST: Letters