To date, the technology allows the wearer to see in black and white, and is most useful for seeing sharp contrasts.

WSJ: FDA Approves Bionic Eye

It is most useful for seeing sharp contrasts, such as the painted white line of a crosswalk on a dark road.

WSJ: The Quest to Create A Bionic Eye Gets Clearer

He drew sharp contrasts with McCain on national security and foreign policy, an area where, polls suggest, voters seem to prefer the Republican.

CNN: Obama blasts McCain, lays out his own agenda

Also, a closer look at the landholdings between the two yields some sharp contrasts. 70, 000 of the 122, 000 acres Passport controls are private lands that are contiguous with no obligation to pay any royalty payments.

FORBES: How Arizona Is Helping America Reduce Dependence On Foreign Natural Resources

But London is filled with sharp social contrasts.

BBC: NEWS | UK | Education | Making the most of life's chance

The bust, called Odore di Femmina - Russian White, contrasts its delicate representation of pretty blooms with their sharp ceramic edges, which, as the artist explains in the adjacent text panel, creates a floral version of the femme fatale.

BBC: Paris�� art world is in full bloom

What's maddening is how much Mayweather's recklessness outside the ring contrasts with his discipline inside it he is a sharp, conscientious, well-studied boxer, which is one reason he's never been beaten, and why a fight with Pacquiao so tantalizing.

WSJ: Jason Gay: Plenty of Pomp, Not as Much Circumstance