Double Double Rainbows

Yesterday in Boston there was a double double rainbow. That is to say not just a rainbow with two ends, but two such rainbows one on top of each other. Based on that Youtube video where some guy is crying because he is seeing a rainbow with two ends I guess just seeing one is pretty rare. In fact before this week I had only seen one other clear and striking rainbow in the sky. I mean not one made from spraying a hose or a prism. The first one I saw was not at all complete, but it was very bright and beautiful.
In Norse mythology the rain bow is supposed to be a bridge from the realm of the gods to the realm of man. The gods realm is above earth. This idea really only makes sense if you see a one sided Rainbow. Because a double rainbow would just be going somewhere over there. And if anyone had gone, somewhere over there, it was the Vikings, so they would know that Odin and Thor didn't live there.
My point is, when we see a rainbow in the sky, we see a beautiful phenomenon caused by light being refracted through water droplets. So seeing a double double rainbow is amazing and beautiful, but readily understandable. But if it is supposed to be a bridge you walk on and suddenly you see two double ones what do you make of that?
It would probably be an earth shattering event. I mean, why are there suddenly two bridges? Maybe people told these stories back then but didn't exactly believe in them the way we believe in scientific fact today. Probably it was just a story the way we have Urban myths and legends. And the point is more about entertainment than education, with morals to the story of course. Either that or nobody ever saw what everyone in Boston saw yesterday.
I mean if there ever was a sign. That was it.