If you guess the obvious wrong answer the choices between green and blue become more and more obvious. If you continue to guess wrong you end up with a boundary

If you guess the obvious wrong answer the choices between green and blue become more and more obvious. If you continue to guess wrong you end up with a boundary hue of 179 or 180 (bluer than 85% of the population). How is this possible? I'd suspect someone making the choices here would be colorblind and well into the 99.9th percentile.