One of the strangest design decisions of Mac OS X is the moving the close window box to be right next to the minimize and maximize window buttons. In the original Mac “System” release, the close and maximize boxes were on opposite sides of the window. You couldn’t miss aim unless you really, really couldn’t tell your left from your right.
In Mac OS X, the closed and maximize boxes were moved to the same corner of the window. And, unlike Windows, their both now just round little buttons. Yes, their different colors unless you suffer from red/green colorblindness like 10% of the male population. Then, good luck telling them apart.
Apple’s interfaces are usually beautiful works. They’re minimal in visual clutter and very effective. However, Apple took two buttons that did two completely different tasks, and moved them to be right next to each other, then removed the visual difference between the two.