Wayuu culture is known for making Wayuu bags or "mochilas". There are many styles of "mochilas". A "susu" is a backpack typically 20 cm-30 cm wide and 35 cm high, used to store personal and work items. Characteristic for the fabrics are the decorating patterns inspired by nature and what the culture sees around. Living quarters are either rectangular or semi-circular. Close to the main house is a common area called a "luma" or "enramada", similar to a living room but almost in the open. Built of six pillars with a flat roof, it is used for everyday duties and to attend to visitors and business activities. Family members hang their hammocks there for the noon nap. Traditionally, the walls are made of "yotojoro" – a wattle and daub of mud, hay and dried canes, but some Wayuu now use more modern construction with cement and other materials. The preferred material for roofing and "yotojoro" wood is the dagger cactus ("Stenocereus griseus"), which the Wayuu call "yosú". The word "yotojoro" originally referred to the cane-like inner wood of the "yosú" cactus. This plant is used for many other purposes: it is planted to create living fences around pastures; young shoots are fed to goats; the fruit ("iguaraya") is similar to pitahaya and is a popular food among the Wayuu. Because the demand for "yosú" as food and wood is seasonal, at times there is little fruit, building material or even cuttings for fences. It has thus been proposed to develop techniques for the Wayuu to cultivate it. Due to varying supply of "yosú" wood for construction, other plants are also used, including "trupillo" or "turpío" ("Prosopis juliflora"), "jattá" ("Haematoxylum brasiletto"), "kapchip" ("Capparis zeylanica") and "kayush" (Peruvian Apple Cactus, "Cereus repandus"). Traditional Wayuu music is closely tied to economy and social life. For example, they sing to their cattle. They also use music for meetings and celebrations, as well as mourning rituals during funerals. La "Yonna" is a traditional dance use to honor guests.