This was a basin that stood at hip- or waist-height somewhere in the caldarium. Its purpose was to provide sweating bathers with an opportunity to splash themselves with cold water. The labrum often stands in an apse specifically designed for it, termed the schola labri (Vitruv. 5.10.4). In more sophisticated and luxurious baths, the labrum was replaced with a multiplicity of heated pools, but it remained popular in smaller facilities.