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Abbeville, St Vulfran Symmetry information Return Symmetry symbol: m Symmetry symbol Schoenflies:   Symmetry absolute number:       3-fold and mirrors   The composition of this unique window is almost like a 'tromp d'oeuil' because the stone tracery is 'almost' 3-fold with the three lobes separated by 120 degrees. However, the lobe at the top is different from the ones at left-right. This effect is accentuated in the stained glass decoration that it is perfectly mirror symmetric. Thus the symmetry of this amazing window should be only m: mirror plane of symmetry , with the stained glass motifs repeated perfectly on the other side by mirror symmetry.