|Tower of Thought|
The Towers of Thought are intended only for the most important research projects or scholarly projects. The towers were used by Ko-Matoran scholars such as Nuju and Ihu. Absolute silence was enforced within the towers, and those who entered them were also restricted to absolute silence. A squad of Vahki Keerakh were usually present to ensured that no one would disturb the scholars or the towers.
- BIONICLE: Metru Nui - City of Legends (First appearance)
- BIONICLE: Encyclopedia (Mentioned only)
- BIONICLE: Encyclopedia Updated (Mentioned only)