Two weeks ago, after my husband Jeffrey and I spent a long day of dodging tightly packed icebergs in the rain and fog, I stood on deck in the misty rain with one of our guests watching a humpback whale feeding. Its flukes arced gracefully and then slipped under the surface. A couple of minutes later the whale's whole body rushed out of the water, tail curled up and flippers slightly flared at its side. It crashed back into the water with a grand splash. We cheered with delight. I thought it couldn't get any better, when a bit of sunlight broke through the mist and a very low rainbow appeared off the starboard bow. As if it knew we were watching, the whale breached again. This time its body reached through the rainbow. Unbelievable, I told myself over and over.