Getting close to the ice which you encounter in the fjords of Greenland really shows you some of the details which you can find. For safety it is the smaller pieces which you can get closer, but these are also those which have been moving more in the water and over time rolling in the water. With these movements you get more of the detail from the water either melting in different directions on the piece of ice or the changes from being above or under water at various times. Looking close at this piece you start to see those lines of water in the ice and the different depth of the ice. This allows the light to reflect differently while you look at the piece.