the four circles represent four humans from each race. there are four races in the world, according to some sciantists, and the colour attribut to each race is :
- the red colour represents the american people,
- the black colour represents the african people,
- the white colour represents the european people,
- the yellow colour represents the Asian people,
it's just a representation, to differentiate between the races existing in the world.
In the representation, each human race, is t holding the hand of the other human race, which represents that each human race is learning from the other race, and the result is a the development and the safeguard of the cultural heritage which is representing by the light, shining in the centre.