Mystery patterns. [Text and photos by Mayank Austen Soofi] Circles and squares rippling with wavelets. A sphere with a labyrinth. The word ‘Aah’ drawn in calligraphic style. And many other shapes. All of these are made with white chalk on the leaf-strewn pavement - including on a manhole. What are these? Artworks? Secret codes? Symbols left behind by a lost civilisation? These indeterminate patterns cover a corner plaza of the Mandi House traffic circle in central Delhi. This sunny afternoon, busy people are walking on these chalk drawings without throwing even a cursory glance at them. A guard on a break from duty at a nearby building is having his lunch by the pavement. He has no idea about the person, or persons, behind