I guess if you look at it that way there are 4. However, one year I had to work pylon 2 alone. I had all I could do just identifying which color it was let alone whether it was up or down. I'll admit I do have a color deficiency (Red/Green) and that might have played into it. With 4 distinct colors you would eliminate the up or down and cut down on the number of people working the cages. Just an Idea, and I don't think anyone can screw up White Vs Black......not even me. Ha.