Why was the grid systems used in ancient Greece and china?

The grid system was utilized in ancient Greece and China primarily for urban planning and organization. In Greece, it facilitated the orderly layout of cities, ensuring efficient movement and accessibility, as seen in the design of cities like Miletus. In China, the grid system reflected philosophical ideals of harmony and balance, helping to establish a cosmological order in city layouts, particularly during the Han Dynasty. Both cultures valued structure and functionality in their urban environments, which the grid system effectively provided.