It is a small device that you move around on a flat surface in front of a computer.

VOA: special.2010.08.01

A ball of clay is placed on a flat wheel device that turns quickly.

VOA: special.2009.09.09

This design, combined with flexible, thin-film batteries, could lead to a flat device that is far less obtrusive than a lumpy generator.

ECONOMIST: Case history

Such is the importance of the iPod to Apple that on June 3rd the firm's shares fell by 4.5% after analysts suggested that sales of the device may be flat in the current quarter.

ECONOMIST: Taking care of its core | The

The screen on the device extended to the edge of the device so that if the device was put flat on a table with the cover on it, the edge would still display an incoming text or email.

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