A very special one indeed! It's not very strong on this one, but you can see a few little oxhair tracers down the side of the blue emanating from the seam. A little story about it with some explanations of the pictures. This is one of four I acquired at the Canton show, mislabeled in a baggie that said "Blue swirls".. Lol A four are same run and all have oxhair.. Only one of them more prominent than the rest. The 4th pic in the middle shows all four together and the picture after that shows the oxhair on each one. Those pics are just for reference so you can see the rest of them, but this single marble here is the only one in this listing for sale. She's in beautiful condition with just a scratch and one small sparkle crescent.