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Country: France, 47


Date: C15


Symmetry symbol: 4m


Symmetry symbol Schoenflies: C4v

Symmetry absolute number: 5

Agen, cathedral

The middle rose window on the facade

Symmetry comment: The outer circle is 4mm but the inside is only 3-fold (triskelium). Contrast makes this window unique



Photograph by: http://www.flickriver.com/groups/629028@N22