[gvarndell]

It will be interesting to see if this becomes a problem.
Even more interesting to see how it's resolved if it does.
As has been pointed out, a properly functioning bot will not have a problem identifying the right colors at the right height and in the right orientation and proximity with respect to each other.
Imagine someone's grandma has shown up wearing a lime green sweater and a terribly pink shawl.
Will grandma be asked to leave if she confuses a bot? ;-)