Tapping the correct icon was satisfying, since it made the whole iPhone interface become a note taker, a web browser, or a calendar. Moving from task to task happened at the speed of thought. Tapping the wrong app icon could be jarring, like realizing you picked up a fork instead of a spoon only after dipping it in a bowl of soup.
Throughout this book, the author not only focuses on user expieriences but, critically, the emotions they would feel under different scenarios. And while Apple famously doesn't do focus groups, employees are continually using prototypes to gauge this user experience for themselves, then sharing their thoughts and feelings using radical candor.
