An ancient chinese "splattered"-ink paiting I saw 2011 in the Shanghai Museum. These paintings obviously depict bamboo, although the written text on them talk about the landscape in the background. There are usually red stamps of the artist littered over the canvas... But this is all (intentional) distraction. When you see such a painting in the dim lit room from a reasonable distance and your eyes focus on the details of the background or the writing, the bamboo leaves start to move. And not in a random manner, like in an optical illusion, but like as if there is a common pattern. It´s the breeze! The artist managed to create a painting of the invisible wind. I knew this is a masterpiece within the first moment of seeing it, but it took me several months contemplating to figure out why. Unfortunately I don´t know the artist anymore. Is it Xu Wei (1521–1593) or maybe Zheng Xie (1693-1765)?