Who invented grid lines?

Answer 1

Grid lines, as a concept for organizing space and providing reference points, have been used in various forms throughout history, so it's difficult to attribute their invention to a single individual. However, the use of grid systems can be traced back to ancient civilizations, including the Greeks and Romans, who utilized grid layouts in city planning and map-making. The modern Cartesian coordinate system, which employs grid lines to define points in two-dimensional space, was developed by the French philosopher and mathematician René Descartes in the 17th century.