One way to think about UIs is if you half-close your eyes, can you still see the shape/structure of the page? A lot of modern-style flat UIs fail this test. (A

One way to think about UIs is if you half-close your eyes, can you still see the shape/structure of the page? A lot of modern-style flat UIs fail this test. (Although flat UIs don't have to, e.g. Windows Phone was flat, but was fine from this perspective.)