It would be good if you could put some coloured TRANSPARENT filler to join it back together, but still leaving a wide stripe.Then stand it against a window for the sun to shine through,I'M GETTING TOO INVOLVED NOW ARN'T I?
Actually, that's the point. They're wayfarers now. They are supposed to go out and find new islands to inhabit instead of staying on the same one. The sea shell symbolizes that they have grown and moved out to sea.