SOS is a symetric self-portrait on film shown at the Whitechapel Gallery in London as part of the Warmhole Saloon in November 2006. In 2010, artist Julian Wolkenstein, made a photographic series on the same subject. You can make your own symmetric portrait with the Echoism app using just your camera phone. In 2013, photographer Alex John Beck also played with the same subject under the title Both Sides Of.

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