River view by night by Aert van der Neer
River View by Night (1696) by Aert van der Neer, now in the Rijksmuseum, was painted by a man who spent a lifetime studying a single subject: how light behaves in darkness.
Look at the water. No moon is visible, only its effect. The river shimmers with reflected light, the clouds glow from below, and one distant window holds a point of warmth. Everything else is deep blue shadow.
Van der Neer built the shimmer in thin glazes: blue laid over dry blue, layer after layer. The yellow highlights, two or three strokes, are all it takes to make the river move.
A contemporary of Cuyp and Hobbema, van der Neer died in obscurity in 1677. This small painting is his answer to one question: what does night actually look like?
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Transcript
One Dutch painter spent a lifetime on a single subject: night. No moon is visible. The whole river carries its light. The clouds glow from below, lit by a moon you never see. He built the shimmer in thin oil glazes: blue painted over dry blue. Yellow laid on blue water. The river moves.