Spasmodic Geyser is another Yellowstone thermal feature with a colorful appearance and an equally colorful name. It isn't just a single geyser, but rather a collection of over a dozen small vents, pools and "mini-geysers", which erupt in a rather irregular and erratic fashion. I timed this image to capture activity in one of the main pools, along with smaller eruptions in a few of the smaller vents. Overall, this is a very fascinating geyser to just sit and watch for a few minutes.