1. A method of visually presenting information to a computer user, the method comprising: receiving, in a computer system, a request to present a first visual item representing a first information portion selected from an information collection available in the computer system; determining, in response to the request: (i) which of several predefined categories the first information portion is associated with, and (ii) which of several predefined generality levels the first information portion has; and generating, on a display device, a presentation that includes an area divided into segments extending between a center and a periphery of the area, the segments corresponding to the respective predefined categories, the area being concentrically divided into levels corresponding to the respective predefined generality levels, wherein the first visual item is placed in one of the segments and at one of the levels according to its determined category and generality level.