For years we’ve considered the online as a two-dimensional space crammed with pages that sit side by side on a flat, infinite plane. But because the devices we design for combat an increasingly diverse array of shapes and sizes, we should always embrace new ways of designing up and down. By building interfaces employing a system of layers, we solve tricky design problems, flexibly adapt to a spread of screens, and make new patterns that will point the thanks to future interactions.
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Graphic Designing on the z-axis simply means incorporating three-dimensional physics—as represented by the z-axis—into our interface designs. Not the faux-depth of skeuomorphic text shadows and button highlights, but an interface made from components that exist on distinct layers and move independently of 1 another.

As Andy Clarke has noted, the page is...