Just like modern libraries, ancient libraries contained different types of art.
Pliny wrote extensively on the art on display in libraries, temples, and public spaces in Rome. Art not only brought visitors to the buildings but also enlivened the space. Pliny believed that users wanted to see what the authors of the works in the library looked like, and the reliefs that hung on the walls were instructive as well as decorative.
Today's libraries, like those of the past, beautify their interiors with different types of art to instruct as well as give the eye something pleasant to view.