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Teacher's Comment
The visual unit that is repeated by translation to form this pattern is composed of a smaller design unit, one-quarter its size, which is reflected both across the vertical axis and again across the horizontal axis. This results in a symmetry group in which there are parallel and perpendicular axes of reflection. In Islamic art, this symmetry group is but one of several symmetry groups frequently encountered in architectural settings, often executed in ceramic tile. It also occurs in woven textile patterns and in the field patterns of carpets.
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