Nowadays we have tons of digital filters that can just about do anything we want to modify an image. Photoshop alone has dozens of filters, some of which go back to the earliest versions of the software. Then there are the third-party plug-ins like Nik and Alien Skin.
But we forget that these digital filters often have their origin in analog effects either while shooting film or in the processing of the film.
This image is of a glass-domed, glass-and-steel modernist building that I shot through the car windshield then with a thick layer of streaming rain. The image was disfigured by the uneven refraction of light through the moving layer of water.