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This article is in 2009 but I am just reading now in 2019. I have always seen floating pattern mandala-like but more random not symmetrical. Most often in the dark or when I close my eyes. I just always thought that was what darkness is or made with. I have never met anyone else who describes this until I read the comments. It is nice to know it is not uncommon and I feel more comfortable now that others see them also.