Glory at Yellowstone imaged June '08 by Mila Zinkova (site).
©Mila Zinkova, shown with permission

Optical effects are everywhere, we just have to know where and how to look. This glory was produced by water drops freshly condensed from volcanically heated water.

The shadow of Mila's head and camera mark the anti-solar point and the bright surrounding glow is the glory. It is probably indistinct because the water droplets had a whole range of sizes. The IRIS simulation below shows a glory from completely uniform droplets.