> "What this source told me is that while developing the iPhone X, members of the team would typically carry two phones with them: a prototype iPhone X they cou

> "What this source told me is that while developing the iPhone X, members of the team would typically carry two phones with them: a prototype iPhone X they could use, but (of course) not while in the presence of anyone who wasn’t disclosed on the project, and an older iPhone they could use in front of anyone. These team members would spend time, every day, using both phones. They knew they were onto a winning idea with the new interaction design for the iPhone X when they started instinctively using the X-style gestures on the older iPhone, and never vice versa. When a new design is clearly better than an old one, it’s a one-way street mentally." Gives some insights into how Apple designers think about UX! Pretty cool!