Here I rotated my square so it's flat and made it bigger. I had to adjust the scale on the Clouds and the FractalSum to compensate. I also increased the values in the Clouds node so there would be more refraction, but it is otherwise the same.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)