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;

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 a first one of the segments and at one of the levels according to its determined category and generality level; and

resizing the first segment and correspondingly resizing a remainder of the segments to maintain a size of the area, wherein the first visual item comprises a folder for at least one other visual item, and wherein the resizing of the first segment occurs upon a user unfolding the first visual item to show also the at least one other visual item, or upon the user folding the first visual item to cease showing the at least one other visual item.