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Neo Gothic
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| Nineteenth Century revival of Gothic style. |
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Nonrepresentational
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| Not representing any object. Not realistic. |
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Norman Slabs
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| Glass blown into a rectangular mold and cut apart on the corners, resulting in square or rectangular pieces that are thin at the edges and thick in the middle. |
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North Side
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| The north or left side of a church is traditionally the side of darkness and the Old Testament, Which is often reflected in the subject matter and colors of these windows. It is not necessarily compass north. |
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O.S.H.A.
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| Occupational Safety and Health Administration, charged with ascertaining that employers provide their employees a place of employment free from recognized hazards that are causing or are likely to cause death or serious harm to their employees. |
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Obscure
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| Non-transparent glass resulting form painting, sandblasting or acid etching. |
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Oculus
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| A circular window without stone tracery. Also called Occhio, Occhi, Oculu. |
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Opak
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| White opal flash on a colored antique. |
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Opal Glass
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| A glass with a milky or resinous appearance. |
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Opalescent Glass
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| Non-transparent or semi-opaque machine-rolloed glass often with two or more colors streaked together. |
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