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Wikipedia definition
1. OculusThis page is about the architectural term. See also: eye. An oculus, circular window, or "rain-hole" is a feature of Classical architecture since the 16th century. They are often denoted by their French name, oeil de boeuf, or "bull's-eye". Such circular or oval windows express the presence of a mezzanine on a building's façade without competing for attention with the major fenestration.
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