A better reference to Apple's rounded corners than BGR's blogspam (linked in TFA) is straight from the source at folklore.org, from Apple early employee Andy He

A better reference to Apple's rounded corners than BGR's blogspam (linked in TFA) is straight from the source at folklore.org, from Apple early employee Andy Hertzfeld himself: https://www.folklore.org/StoryView.py?story=Round_Rects_Are_Everywhere.txt https://www.folklore.org/StoryView.py?story=Round_Rects_Are_...