A hexagonal window (also Melnikov's or honeycomb window)[1] is a hexagon-shaped window, resembling a bee cell or crystal lattice of graphite. The window can be vertically or horizontally oriented, openable or fixed. It can also be regular or elongately-shaped and can have a separator (mullion).
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.
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