Four Sided Triangle - Production Details

Production Details

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Four-Sided Triangle was an early effort by Hammer Studios. The laboratory set is very impressive; it contains a mix of realistic gadgetry - an oscilloscope, functioning gauges, etc. - with the transparent domes, flashing lights, and electrical paraphernalia that are so dear to movie studio art directors. The picture relies on a minimum of trick photography. There is one brief and poignant shot of Helen (the duplicate woman) wistfully peering through a window at Lena (her template) who is looking at Robin. This camera set-up (a double exposure) is the only moment in the entire film when Lena and Helen are both shown onscreen at the same time.

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