Last February 19 we wrote about an art historical concept that applies very well to entrepreneurship: chiaroscuro.

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Caravaggio's artistic style, self-taught and hugely inventive, is instantly recognisable stark, vivid and naturalistic, with emphasis on light and shadow, or chiaroscuro.

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Caravaggio has begun here to master what became one of his celebrated hallmarks, the use of chiaroscuro (light and shadow) for both theatrical and formal effects.

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The opening sequence, showing Mardi Gras revels in New Orleans through the frenzied chiaroscuro of streamers and wrought iron, evokes psyches already ratcheted to fever pitch.

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The film's attraction (such as it is) isn't found in story, but in decoration: the blue-filtered chiaroscuro and etch-y comic book compositions, how the snow glints under the streetlights.

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The ensuing chases and reversals permit Alton and the director, Anthony Mann, to etch postwar California in a vivid pulp chiaroscuro the action is lit by flame and shrouded in fog.

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