I'd be the first to admit that this photo is a little strange and not a very good one but it shows what I intended--the smoke ring at the top. This plume comes from the OreIda plant in Ontario OR. I don't know why it forms or if it was designed intentionally but I look for it each time we pass by. A puff of cloud comes out, it slowly drifts upwards and then forms a circle. Pretty cute, especially for something "industrial."