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Glass has evolved throughout its history from an object of rare fascination, to having important decorative qualities, and to becoming critical to both art and daily use. Glass likely has its origin as a byproduct in the production of pottery or metals, as under high temperatures ceramic clays or metal production byproducts, including silica, may vitrify forming a glassy-layer.<ref>For information about the earliest history of glass production, see: Macfarlane, Alan, and Gerry Martin. 2002. <i>Glass: A World History</i>. Chicago: University of Chicago Press.</ref> Perhaps the earliest glass anywhere comes from the ancient Near East or Egypt, by roughly 3500 BC, when temperatures in kilns started reaching higher temperatures as kiln technologies improved.