for the Taung Child, are formed within a secondary limestone deposit called tufa. There is numerous evidence for other early human species inhabiting caves from at least one million years ago in different parts of the world, including Homo erectus in China at Zhoukoudian, Homo rhodesiensis in South Africa at the Cave of Hearths (Makapansgat), Homo neanderthalensis and Homo heidelbergensis in Europe at Archaeological Site of Atapuerca, Homo floresiensis in Indonesia, and the Denisovans in southern Siberia. In southern Africa, early modern humans regularly used sea caves as shelter starting about 180,000 years ago when they learned to exploit the sea for the first time. The oldest known site is PP13B at Pinnacle Point. This may have allowed rapid expansion of humans out of Africa and colonization of areas of the world such as Australia by 60–50,000 years ago. Throughout southern Africa, Australia, and Europe, early modern humans used caves and rock shelters as sites for rock art, such as those at Giants Castle. Caves such as the yaodong in China were used for shelter; other caves were used for burials (such as rock-cut tombs), or as religious sites (such as Buddhist caves). Among the known sacred caves are China's Cave of a Thousand Buddhas and the sacred caves of Crete. As technology progressed, humans and other hominids began constructing their own dwellings. Buildings such as huts and longhouses have been used for living since the late Neolithic. Ancient era Post-classical era From the 14th to the 16th century, homelessness was perceived of as a "vagrancy problem" and legislative responses to the problem were predicated upon the threat it may pose to the state. Modern era According to Kirsten Gram-Hanssen, "It can be argued that historically and cross-culturally there is not always [a] strong relation between the concept of home and the physical building, and that this mode of thinking is rooted in the Enlightenment of the seventeenth century". Before, one's home was more public than private; traits such as privacy, intimacy and familiarity would proceed to achieve greater prominence, aligning the concept with the bourgeoisie. The connection between home and house was reinforced by a case law declaration from Edward Coke: "The house of everyman is to him as his castle and fortresse, as well as his defense against injury and violence, as for his repose". Colloquially, this was adapted into the phrase "The Englishman's home is his castle"