English: Stress induced birefringence in the plastic making up a transparent PCI fan. The rainbow coloured fringes become visible when illuminated with polarised light and photographed through a crossed polariser. The small squares in the image are the pixels of the polarised light source (an LCD screen).
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{{Information |Description={{en|1=Stress induced birefringence in the plastic making up a transparent PCI fan. The rainbow coloured fringes become visible when illuminated with polarised light and photographed through a crossed polariser. The small square