While icons on iOS (formerly iPhoneOS) have always been rounded squares, and rounded-square icons have existed on Apple platforms for over 20 years now, Mac app icons have historically exhibited a variety of unique silhouettes, which helped identification alongside other visual tools like color, lighting, and dimensionality.

Because app icons from the Mac OS X era are so beloved, it’s very understandable—relatable even—how mandating rounded square app icons is downright heartbreaking to long-time Mac OS X users.

What happened? Why did this happen? And what should we do?