  Public touchscreens are filthy and, regardless of how often they are cleaned,
they pose a considerable risk in the transmission of bacteria and viruses.
While we rely on their use, we should find a feasible alternative to touch
devices. Non-touch (touchless) interaction, via the use of mid-air gestures,
has been previously labelled as not user friendly and unsuitable. However,
previous works have extensively compared such interaction to precise mouse
movements. In this paper, we investigate and compare the usability of an
interface controlled via a touchscreen and a non-touch device. Participants
(N=22) using a touchscreen and the Leap Motion Controller, performed tasks on a
mock-up ticketing machine, later evaluating their experience using the System
Usability and Gesture Usability scales. Results show that, in contrast to the
previous works, the non-touch method was usable and quickly learnable. We
conclude with recommendations for future work on making a non-touch interface
more user-friendly.
