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Knowledge Towers were different towers, and they were located in Ko-Metru. Their purpose was to act as a place for Ko-Matoran Scholars to work and study. Each one contained living quarters, libraries and laboratories. When the Toa Hordika were searching for the Makoki Stones for Rahaga Norik, Nuju found his Stone in the Knowledge Towers. Knowledge Towers were grown by tossing a crystal into a basin located on the ground. The Ko-Metru Great Disk was found in an icicle on a Knowledge Tower. Prior to becoming a Toa Metru, Nuju also worked in a Knowledge Tower.