Invisible Details of Interaction Design

Great interaction design can be understood by examining its invisible details, which often reuse real-world metaphors, such as swiping that suggests a deck of cards. Gestures should trigger actions based on intent: the iOS App Switcher dismisses an app only after the gesture ends, while lightweight overlays can trigger mid-swipe. Frequent keyboard and mouse actions, like command menus used hundreds of times a day, may feel better without animation, and the bmrks.com bookmarking tool felt faster after its motion was removed.