Colonies in UKE archive older walls. Consume detritus, accidentally maintain structural integrity. Archivists know which colonies to leave undisturbed.
Colonies embedded in the UKE archive's older walls. Consume detritus and debris — dead organic material, dust accumulation, polymer breakdown products. Maintain structural integrity through accidental biological action.
Archivists learned which colonies to leave alone over decades of observation. The colonies in the east wing near the restricted archive section have been there longer than the current archive administration. Removing them would destabilize sections of the building that can't be reinforced without tearing apart the wall.