The oldest record of barrel vaults is estimated to date back to 4000 BC. These provided the spans in the Sumerian ziggurat at Nippur in Babylonia, built from fired bricks amalgamated with clay mortar. This type of vault was built as a continuous round arch and became a characteristic architectural element of Roman architecture, later used also in Renaissance architecture.

+ 20

Aquatic centers are defined by activity. Making space for focused exercise and leisure alike, they are designed to support different scales of movement. At their core, they center on swimming pools. These structures explore ideas of light and space spanning millennia, from Pakistan's "Great Bath" at the site of Mohenjo-Daro and Ancient Greek palaestras to contemporary swimming complexes.

+ 6