Human: Write a detailed description of a eerie scene inside a prison with a dark grey carpet and doors leading to private cells. Assistant: 
A dark grey carpet decorated with a pattern of crossing black lightning bolts covers the floor, matching the decoration on the grey-painted walls. A constant, low thrum hangs just inside the range of hearing, its source nearby but not readily apparent. Doors spaced in an even circle around the perimeter lead to initiates' private cells.