Polarized light bathes us. It is of the blue sky, even of grey clouds, rainbows and the glory. Ice in the sky separately polarizes rays to double sundogs. Iceland spar is more extreme, polarizing and dramatically doubling objects. Butterflies and other creatures use polarization. It manifests wherever there are reflections.

Gunther Konnen's book on polarization is now freely available for download here. Gunther is a foremost expert on atmospheric optics and his book encompassing so many aspects of polarisation in nature is a true delight to read.
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