sentences:  In the other, called "gereh-chini" small wooden panels of geometric shapes are created individually, and combined to create an elaborate design.In 10th century a systematic investigation of geometric patterns was conducted by Persian mathematician and astronomer Abu al-Wafa' Buzjani in the House of Wisdom.In his treatise "A Book on Those Geometric Constructions Which Are Necessary for a Craftsman", he explained the geometric structure and illustrates the methods of drawing polygons within other shapes )mostly circles) for craftsmen and artisans.