Yes, but often not in the interaction areas: http://toastytech.com/guis/macos1.html http://toastytech.com/guis/macos1.html Or, take a look at the interaction m

Yes, but often not in the interaction areas: http://toastytech.com/guis/macos1.html http://toastytech.com/guis/macos1.html Or, take a look at the interaction mechanisms and palettes in MacPaint: https://www.punchkick.com/blog/2015/08/07/how-apple-has-shaped-the-user-interface https://www.punchkick.com/blog/2015/08/07/how-apple-has-shap... Even in the 1990s, it was a lot of squareness. And, as I point out, physical objects have rounded corners for a reason. Computers GUIs do not share that reason. Rounded corners are a design choice. A different design choice can be made. One other thing that people forget is that rounded things generally suck for packing.