In the 1970s, Californian artist Louis Hock created a number of studies in the effects of pure colour. The late 1960s saw the rise of the ‘colour field’ vogue which arose in abstract painting in reaction to the emphasis on individual expressive gestures in Abstract Expressionism. ‘Colour field’ artists like Mark Rothko and Barnett Newman sought to empty the image plane out into broad, flat areas of colour. With its humming bars of pure hues, Light Traps is like a moving ‘colour field’ painting – a ‘colour field’ film. Preserved by the Academy Film Archive in 2013.