He had a wire grid standing in front of him, and a similar grid drawn on a paper. Looking at the subject thruogh the grid, he saw one part of the subject through each square of the grid. He then drew in each square on the paper exactly what he saw through each square of the wire grid.
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He created the grid system for painting. He draws huge grid patterns and works on one square at a time.
It was Da Vinci in Italy .
http://wiki.answers.com/Q/Why_does_chuck_close_paint_using_a_grid_system" http://wiki.answers.com/Q/Why_does_chuck_close_paint_using_a_grid_system"