In addition to mastery of traditional calligraphy, the art of engraving requires a high degree of virtuosity, since the artist works on a tiny surface area where every curve, every thickness of line counts.

UNESCO: Culture

While the screen's surface is completely flat, the edges curve around gently, forming a rounded back.

ENGADGET: Nokia Lumia 620 review: precisely what an entry-level smartphone should be

In the past a product's shape alterations would be hammered out by designers in a surface-modeling program, a tool that allows for easy curve design and concept change.

FORBES: Easy Designer