Edited by Gülru Necipoğlu with her preface and opening essay, The Arts of Ornamental Geometry: A Persian Compendium on Similar and Complementary Interlocking Figures (A Volume Commemorating Alpay Özdural, Studies and Sources on Islamic Art and Architecture: Supplements to Muqarnas, vol. 13, Brill, 2017), this work focuses on a unique medieval document in Persian. It is the only known Islamic primary source (datable to ca. 1300) showing geometrical drawings of ornamental patterns that are accompanied by step-by-step textual instructions in Persian, explaining how to draw those complex figures (Fī Tadākhul al-ashkāl al-mutashābiha aw al-mutawāfiqa, Bibliothèque nationale de France, Ms. Persan 169, fols. 180r–199v). This book is in congruence with the current interest in Islamic geometrical patterning as an inspiration for tessellation and parametrically derived figures in contemporary art and architecture. Considering the multifaceted relation of this source with historians of art and science, as well as mathematicians, physicists, artists, and architects, it aims at providing easier access to such an important source on practical geometry. The volume contains a transcript of the Persian manuscript, along with its transliteration and translation into English (by Wheeler M. Thackston), and analytical drawings made by the late Alpay Özdural (d. 2003).