The present invention relates to a method of representing information on a three-dimensional user interface having multiple portals, in which data is associated with each of the portals. A symbolic marker is associated with each of the portals according to a pre-specified scheme, and displayed in the respective portals. In a preferred embodiment of the invention, the symbolic marker is a colored marker. By color-coding the portals, data associated with the portals can be classified into a number of categories to provide the user with a summary of the data on the three-dimensional user interface at a high level of abstraction. The three-dimensional user interface may be adapted to update the colored markers more efficiently, and to display them using less computing resources than would be required if more memory-sensitive visual cues were displayed.