Rather as in the economic sphere competing private companies tend to produce wealth and activity, whereas monopoly firms have the opposite effect, so in the religious sphere competing sects generate a ferment of activity and increased levels of belief, whereas state churches produce indifference.

ECONOMIST: Therapy of the masses

The Internet has become the public space of the 21st century, a sphere of activity for all kinds of activities, open to all people of all backgrounds and all beliefs.

WHITEHOUSE: VP's Remarks to London Cyberspace Conference

Which means that you might just as well set sail in search of an eighth continent as try to find a sphere of human activity unchartered in the blogosphere.

CNN: Shortcuts: Writing a blog

Kinect has been touted as a way to get more physical activity into the traditionally sedentary sphere of video games since the days of Project Natal, and now it appears like Microsoft is developing some powerful new software to start quantifying just how much players are moving around.

FORBES: Report: Microsoft Working on "Kinect Play Fit" With Heart-Rate Monitor