When the two meet, the interference pattern produced, if captured on photographic film, has the ability to change a new reference beam into a new object beam.

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In a 35-nanosecond burst of laser light, 4.3 megabytes of a color image are burned on a photosensitive DuPont polymer film, rearranging the chemistry into a zebra-striped interference pattern.

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They are expressions of a patriotic identity, transcending politics, to which Iranians attach themselves in times of uncertainty and peril and which Iranian film-makers, ever anxious to analyse the vicissitudes of their society, keep exploring, official interference notwithstanding.

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