Typically, the cellular window[2] is used for an attic or as a decorative feature, but it can also be a major architectural element to provide the natural lighting inside buildings.
The hexagonal window is relatively rare and associated with such architectural styles as constructivism,[3] functionalism[4] and, occasionally, cubism.
Attic hexagonal windows were occasionally used in the Northern European manor architecture of the 19th century.
The concept became popular thanks to the Russian constructivist architect Konstantin Melnikov,[5][6] whose own famous house had 124 hexagonal windows, which were the main source of light as ceiling lights were not provided in many rooms.
Today, hexagonal windows may be associated with honeycomb houses, a concept proposed by architect Frank Lloyd Wright[9] and explore an idea of organic architecture, which considers the nature as a main source of architectural imagination.