 It was unusual in Roman culture for someone to be buried within a library or even within city limits, so this was a special honour for Celsus, reflecting his prominent role as a public official.The three remaining walls were lined with either two or three levels of niches measuring 2.55x1.1x0.58 m on average, which would have held the "armaria" to house the scrolls.These niches, which were backed with double walls, may have also had a function to control the humidity and protect the scrolls from the extreme temperature.