It bends because all of us are putting our hand on the arc and we are bending it in that direction.

WHITEHOUSE: Remarks by the President at a DNC Event

"The coastal plain of the refuge is only a tiny fraction of the entire North Slope of Alaska, " he argued, waving his hand in a wide arc.

CNN: mountain

Deep in the shine of the polished glass, her hand rose in a graceful arc to remove her straw hat.

NEWYORKER: Miracle Polish

The wheel wrenched out of my hand and we started over in a big arc, the right front wheel caught sideways in the clay.

WSJ: Hal Holbrook Remembers a Road Show Wreck | Traveler's Tale

Yes, it feels good in the hand, owed in part to that matte plastic back and subtle arc S-like curve, but the materials feel cheap.

ENGADGET: Sony Xperia TL for AT&T hands-on (video) Mobile