[mbrock]

Meditation is not a unitary practice. There are important forms of meditation that involve extreme concentration on a single object, inducing unimaginably strong "tunnel vision."

For an obvious example, consider the kasina practice of old-school Theravada Buddhism.

http://web.archive.org/web/20031230220324/http://www.birken....

Breath concentration is done in a similar way, but with the sensation of the breath as the object of fixation rather than a colored disc.