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Visualize Vector Fields Using Line Integral Convolutions
Use line integral convolution of a vector field with an image.
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Click for copyable input
LineIntegralConvolutionPlot[{{Cos[y] - Sin[x]^3, -.1 y - Sin[x]}, 

  ExampleData[{"TestImage", "Lena"}]}, {x, -2, 4}, {y, -2, 4}, 

 LineIntegralConvolutionScale -> 0.3, RasterSize -> 300, 

 ImageSize -> Large]
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