A little water activity with the colorful Rainbow Swash (National Grid) gas tank in the background.

A little history (http://www.celebrateboston.com/strange/rainbow-swash.htm):

“In 1971, artist Corita Kent (1918-1986) designed the rainbow swash which was painted on one of the storage tanks in Dorchester. The tanks were quite drab, and the rainbow painting greatly brightened the commute for many Bostonians along the Southeast Expressway (I93).

If you look closely at the blue swash, some people believe it resembles the profile of Vietnamese Leader Ho Chin Minh. A forehead, nose, lips, and long beard, might be discerned. In 1971, the United States was at war with Vietnam, and some people believe the blue swash was intentionally designed as a public protest. Corita Kent was a promoter of peace in the world, but denied that a profile was embedded in the rainbow.
The storage tank was eventually demolished, and the rainbow swash was painted on the remaining tank. It is said the nose was made less pronounced on the second tank. Art is perceived by the eye of the beholder, and one can likely see other things in this rainbow.”