Hula Hoop Advice

[Momof4]

I've heard of this before to keep children apart but I think it would have to be very extreme circumstances with some bad behaviour for me to ever ask them to do this. I want all the children to learn to play together, share, take turns, have good socialization skills, so I don't understand the reasoning behind separating them into circles. I'll be interested to see the reasoning behind this theory.