Mobile devices … seamlessly bridge the gap between the physical and digital realms, making information and services readily accessible to their users at all times. Mobile design is a balancing act between functionality and simplicity, in which the goal is to create a user experience that is easy to use for all.

In a distracted environment, the best form of smartphone interaction is a high-speed, easy-to-use one. Luke calls the typical mobile usage a "one thumb, one eyeball" experience, since the highly distracted environment causes most mobile users to engage in one-handed use with short spans of partial attention.