In Indus Valley Civilisation (about 3000 B.C.), the bricks used for construction work were having dimensions in the ratio:

From 3200 to 1300 BC, the Indus Valley Culture (IVC), often denoted by its major city Harappa, lasted nearly two millennia. Its history dates back to around 6800 BC, when a 4000-year expansion of villages and towns, trading activity, and technological advancements culminated in the construction of large brick-built cities between 2600 and 1900 BC. 

In Indus Valley Civilization, the bricks used for construction work were having dimensions in the ratio length : breadth : thickness = 4:2:1.