Today we completed the exercise that I demonstrated last week of two grid color studies based on a landscape photograph. In the first painting you imagined the photograph divided into six squares. For each square section of the photograph you chose a single color that best represented all the colors in that square and filled in the corresponding square on your canvas. For the second painting you repeated the same process dividing the photograph into more, smaller squares.
The purpose of this exercise is to be able to edit complex visual information and see larger compositional relationships. This is essentially what we are doing every time we paint except we usually don't reduce the image to a grid of squares - we usually simplify the composition to more recognizable shapes.