Abstract: A method, in one embodiment, of displaying items arranged in a hierarchy, the hierarchy having predetermined levels and divisions. The method comprising: displaying divisions of a first level of the hierarchy along a first direction; and displaying the items on a plane in perspective view, each item arranged at a position corresponding to the division with which it is associated in a respective second direction at an angle to the first direction. It is preferred that each of the items has associated with it a value, such as a time value, that can be represented on a scale. The divisions of the first level of the hierarchy are first units of the scale, such as years, and the items are arranged at positions corresponding to their value with respect to the first units.