Circles are a very mystical form. They are considered the perfect shape and for that reason, they hold great meaning in folklore and superstition.From King Arthur's round table to chanting circles to drumming circles, even to bagels which are eaten to promote good luck on certain holidays, the circle is a perfect form to represent the full completion of the life cycle.
Circling is said to form a protective shell around the person circled. That is one explanation for the bride circling the groom at Jewish weddings.
More recently Circling has taken on a more psychological adaptation incorporating meditation, conversation and perhaps a bit of performance art.