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Tracery of Light and Shadow

Essays on light, colour and perception — for people who shoot and for people who just look

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The blue hour in a photograph: the scene goes cold on its own, with no colour grading

Photography · 19 August 2026 · 12 minThe Purkinje effect: how dusk changes not only colour, but the way a photograph feelsWhy red sinks into shadow at twilight while blue stays bright — and what to do with that in post