"You get the most 3D effect when it starts about three to four seconds, that's when it starts feeling 3D. And then what you do, quick shots are always flat."

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The paintings are not just on flat walls - you have these enormous niches, bulges and protrusions, as well as stalactites and stalagmites. The effect of the three-dimensionality is phenomenal. It's a real drama which the artists of the time understood, and they used it for the drama of their paintings.

— Werner Herzog