During the sixties of the 20th century, there was a movement for civil rights by African Americans who caused the struggle of racists against them.
Thus, in 1968, the assassination of Martin Luther King was carried out and on that occasion, Jane Elliott conducted a stunning exercise.
Jane Elliot, a world known teacher of diversity, exposes prejudices to an irrational class system based on some arbitrary factors.
This famous exercise called blue eyes / brown eyes consists in not providing equal conditions for children with blue and children with black eyes. Children who have less rights from the beginning have a sense of inferiority. Children with brown eyes were sitting in the back, were noted much more for the same or lesser offenses than those made by children with blue eyes. By the end of the working day, children with brown eyes put their eyes down, and the tasks they were doing were worse than usual. In addition, otherwise withdrawn and silent students with blue eyes worked much better and were louder than usual.
This only shows that if from the very beginning everyone does not have the same conditions, those who are in a subordinate position on the basis of someone's decision will work poorer and will feel inferior.
It is the same in relation to real life. Afro Americans had a feeling of inferiority, while racists were more loud and violent by conditions that were not equal for everyone.