When two (twins) meet a third force is created, that must be balanced by the two. There may be a separation again, but both will be changed, and will meet again.Twins are magnetically drawn to each other.
Compare it to a meeting of cold and hot air, the third force is a tornado.I know this is a bit of a strong comparison, but this is how I can best explain it. So we have one and one is three. Two must find balance.