A column is a group of three brain cells, with each cell responding to a different aspect of a visual stimulus. For example, when presented a thick, vertical, blue line, one cell interprets the thickness of the line, the second cell interprets the orientation of the line, and the third cell interprets the blue color. They work together to enable you to see a thick, vertical, blue line. A column receives information from either the left eye or the right eye.
See also: Hypercolumn