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Teacher's Comment
Each square unit is composed of five nested squares; four such units are combined to form a single large tile that is symmetrical by both horizontal and vertical reflection. Visually, the large tiles are repeated four times. Because of the blue connecting lines, these tiles do not exhibit rotational symmetry.
This relationship of tiles, and the way they are used to cover the plane is familiar in Islamic art in the decoration of architectural monuments with square ceramic tiles. Examples may be seen in monuments from Spain and North Africa to Turkey, Iran and Uzbekistan, and from the 8th century to a peak of production in 16th century Ottoman Turkey.
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