Keywords: Darb-i Imam shrine spandrel.JPG en Girih-tile subdivision found in the decagonal girih pattern on a spandrel from the Darb-i Imam shrine Isfahan Iran 1453 C E A subdivision rule to construct perfect quasi-crystalline tilings has been identified http //www sciencemag org/content/315/5815/1106 full The thick black lines demarcating girih tiles of decagon and bowtie shapes are subdivided into a smaller pattern which can also be perfectly generated by a tessellation of girih tiles درب امام اصفهان 2012-02-05 http //www sciencemag org/content/315/5815/1106 full Fig 3A Unknown artisan 15th century PD-Art Uploaded with UploadWizard Girih Girih tiles Darb-i Imam |