People get easily bored with trends, and every few years, the pendulum swings from one way to another. We have all seen the rise and fall of iconic fashion pieces or art movements. The same thing happens in User Interface (UI) design.

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.

User interface design is hard. With so many options to choose from regarding layout, spacing, typography, and colour, making design decisions can be overwhelming. When you add usability, accessibility, and psychology to the mix, it gets even harder. Luckily, UI design doesn’t have to be so hard.

Fitts's Law describes how long time it takes to click a target, based on the distance to the target and its size. Use this information to make buttons and links faster to click.