"What is striking is that fractals, or at least hints of them, have been under our noses all along. “Fractals as a tool of science are useful, but the idea of fractality has been there for ever and ever,” says Dr Mandelbrot. Many painters had an eye for fractals, he notes, including Leonardo da Vinci, Eugène Delacroix and, in particular, Katsushika Hokusai, some of whose paintings of landscapes and crashing waves contain regular, fractal-like structures."