Caught on the wing in a rapid sketch.
A double rainbow in a shaft of light, over Hampstead Heath; he worked this up into a large painting, but I prefer the sketch.
Over Stonehenge, as part of a dramatic lighting pattern for expressive purposes.
Some of Rubens' landscapes have double rainbows in them, it fits in with the general atmosphere of excess, but here is something less familiar from long ago, a painting by Jan Siberechts of Henley-on-Thames, dating from about 1690.
Millet's Springtime, a double rainbow as part of a symbolic landscape.