In reply to rallymania:
i had a job for a while developing stuff like this, tho more specific and far more confronting.
we looked at this test being done by several groups (including once on oprah) and its notable how similar the outcomes are whether its school kids, middle class mums, government workers or corporate groups. theres a threshold of intellect thats reached, then after that it becomes the same old emotive tribal stuff.
we used to manipulate the led in factors to alter the specific application of the exercise, and after a while you get to see how the prejudices arise and how they can be curtailed.
my favorite was another classic where 2 groups are given mock social parameters they have to follow, but neither knows the others and they are kept apart, only interacting by one individual visiting the other at a time, then reporting back.
many of the same elements were used as found in the eye colour scenario.
very eye opening. i think about it all the time.