Yes, the colors indicate the correlation between the profession and the income. A darker color means that the profession is more likely to actually contribute t

Yes, the colors indicate the correlation between the profession and the income. A darker color means that the profession is more likely to actually contribute to the income, while a lighter color means that those 1-percenters probably married into wealth or inherited passive income. In a graph showcasing the professions of the wealthy, the color is actually more significant than the relative sizes of the boxes.