StineandTeit,youraverageurbanmiddle-classartistsandintellectuals,leaveCopenhagenforthewildsofneighbouringSweden’sforest.Soon,theyfindoutthatsomethingisstrangethere–mostdisturbingly–whentheirsonNemosuddenlythinkshismotherisn’treallyhismotheranymore.ItbecomesclearonceStineandTeitdiscoverthattheyhaveneighbourswholookexactlylikethem–mirrorimagesmadefleshandblood.Thesubjectofreflectionsanddoublesisintroducedinthefilm’sfirstshot:aviewofalakelandscapeturned90°sothatthewater’ssurfacerunsverticallythroughtheimage’scentre.Onlyoncetheshotgetstiltedisitrevealedwhichsidemirrorswhich.Later,amotherandchildarereflectedinaglassdoor.However,thisisnotyourdoppelgangerthrillerofthegothicvariety.Notethetitle:inphysics,superpositionmeans(perMerriam-Webster)"thecombinationoftwodistinctphysicalphenomenaofthesametype(suchasspinorwavelength)sothattheycoexistaspartofthesameevent".Thisismoreametaphysicalmeditationtowardstherealisationthatnoneofusiseveralone,butalsoneverunique.

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