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![[Figure 3]](dz5317fig3mag.jpg)
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Figure 3
Two examples of cyclic 12-fold symmetry in rose windows with two radically different arrangements. (a) View of the rose window in the main façade of the church of Santa María del Pi in the Cita Vella of Barcelona. The construction and symmetry is very similar to that found in the upper rose window at the main entrance to Reims Cathedral in France. From the central sixfold repeat the number of `rays' doubles (left to right) as it expands out to 12 `petals' and contains 24 curved triangles on the outmost edge. Ignoring the innermost hexagon, the rose has symmetry C12v (12mm). Image from the author's personal collection. (b) View of the rose window inside the chapel of the Bourbon in the cathedral of Lyon, France. Image obtained from the website http://www.therosewindow.com. The pattern exhibits only cyclic 12-fold symmetry (C12). Further details can be found on the website and also in the book by Cowen (2005  ). Reproduced from the website with permission. Courtesy of P. Cowen. |
![[Figure 3]](dz5317fig3.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
