Office 2013 conforms to Microsoft's "Metro" look that's pervasive across the software developer's latest mobile apps. Note the flatness of the Office Ribbon in Word 2013 (above) versus its predecessor in Word 2010. Much of Office's eye candy, including three-dimensional elements and the translucent Aero UI that provided a hazy peek at the Desktop behind the open program, is gone.
Don't care for the Office Ribbon? As with Office 2010, when you switch to full-screen model, the Ribbon vanishes. To retrieve it, simply click three small dots in the upper-right corner of the screen.