FRACTAL ISTANBUL CENTRO MUNDI - NORTH COLLECTION City observer Tarık Tolunay has been producing Istanbul-focused city maps for 10 years for his project called Fractal Istanbul. CENTRO MUNDI, the last link of the project, is the product of 9 months of day and night work. It is about the last years of Istanbul, one of the cult cities of the world with its thousands of years of history. It is a 10 billion pixel sized mega work. Dozens of illustrations combine to form a big panorama.