 In some ethnic groups, the houses are built on platforms that resemble catamarans.Among the Nage people, a woven representation of a boat is added to the ridge of the roof; among the Manggarai people, the roofs of houses are shaped like an upside-down boat; while among the people of Tanimbar and eastern Flores, the ridge itself is carved into a representation of a boat.Furthermore, elements of Austronesian structures (as well as society in general) are often referred to in terminologies used for boats and sailing.