Deconstructivism is a branch of Modernism. It shares Modernism’s lack of applied ornamentation and other aspects of the Modernist vocabulary. However, rather than being composed simple forms, Deconstructivist buildings often use abstract and non-geometrical forms. They often have no immediately apparent visual logic, often appearing fragmented and having unusual penetrations. The advent of 3D computer modelling has enabled the creation of the complex forms in these buildings, which would previously have been very difficult to design, visualize and engineer.