  The earliest origins of mathematics in the Indian subcontinent is generally
dated around 800-500 BCE when the {\em Sulbasutras} are thought to have been
written. In this article we suggest that mathematical thinking in South Asia,
in particular, geometry, may have had an even earlier beginning - in the third
millenium BCE. We base our hypothesis on the analysis of design patterns, such
as complex space-filling tiling, seen on artifacts of the Indus Valley
Civilization (also referred to as the Mature Harappan Civilization, 2500-1900
BCE) which speaks of a deep understanding of sophisticated geometric
principles.
