Kaleidoscope based on Rose window at Strasbourg Cathedral

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Strasbourg Cathedral is a Roman Catholic cathedral in Strasbourg, France. Although considerable parts of it are still in Romanesque architecture, it is widely considered to be among the finest examples of high, or late, Gothic architecture.

A Rose window is often used as a generic term applied to a circular window, but is especially used for those found in churches of the Gothic architectural style and being divided into segments by stone mullions and tracery. In northern France, a rose window is usually the central feature of the facade. The transept facades commonly contain rose windows as well. Source: Wikipedia: Strasbourg Cathedral.

Sacred geometry is geometry used in the design of sacred architecture and sacred art. The basic belief is that geometry and mathematical ratios, harmonics and proportion are also found in music, light, cosmology. This value system is seen as widespread even in prehistory, a cultural universal of the human condition.