6. The computer-implemented method of claim 5 wherein the color of each shape becomes a blend of the first color and the second color as the second value of the second metric increases or decreases.
6. The computer-implemented method of claim 5 wherein the color of each shape becomes a blend of the first color and the second color as the second value of the second metric increases or decreases. 8. The computer-implemented method of claim 6 wherein an amount of the second color in the blend of the first color and the second color increases as the second value of the second metric of each item decreases.