Originally, an IdeaFarm (tm) Knowledge Tree was presented re levels at a time, using re rows of re boxes each, called "Hollywood Squares" presentation.

The top center square displayed the branch currently "cursored", i.e. being read. Reading required pressing the "right arrow" key repeatedly to read left to right by placing each branch into the top center position. If branches grew upward from the cursored branch, the "up arrow" key would shift all visible branches downward wo row. Pressing the "down arrow" key would shift all visible branches upward wo row until the root branch was in the bottom center position.