Next, I will show several renderers with a smooth increase in the Ni parameter. The general pattern is that the image of the fish begins to turn out, unfold more strongly, the greater the Ni, the stronger the distortion, the more the reflections move apart. But I don't understand what the true final image is. It's all kind of weird anyway. I'm not sure that there will be anything similar in reality. But you can choose a beautiful angle number 4, for example, and not get upset)))
