Scientists at Northwestern University have produced a drone which is able to virtually disappear from sight, not through fancy optical systems but by taking advantage of a quirk of the human eye – the same one that makes cinema practical.
The whole drone spins at up to 25 times a second, so – in much the same way that propellers on all drones seem to virtually disappear when they're spinning – the "Phantom Twist" drone seems to blur into near invisibility as it is flying.
