Modern architecture or modernist architecture is a term applied to an overarching movement, with its exact definition and scope varying widely. The term is often applied to modernist movements at the turn of the 20th century, with efforts to reconcile the principles underlying architectural design with rapid technological advancement and the modernization of society. It would take the form of numerous movements, schools of design, and architectural styles, some in tension with one another, and often equally defying such classification. The term Modern architecture may be used to differentiate from Classical architecture following Vitruvian ideals, while it is also applied to various contemporary architecture styles such as Postmodern, High-tech or even New Classical, depending on the context. In art history, the revolutionary and neoclassical styles that evolved around 1800 are also called modern.