Boss (architecture)

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In architecture, a boss is a knob or protrusion of stone or wood, usually used in the ceilings of buildings, particularly at the intersection of a vault.

In Gothic architecture, such roof bosses (or ceiling bosses) were often intricately carved with foliage, heraldic devices or other decorations. Many feature animals, birds, or human figures or faces, sometimes realistic, but often grotesque: the Green Man is a frequent subject.