3" x 3" sticker printed on waterproof and weather-resistant vinyl. Someone once asked me "what is this marshmallow character?" That person, obviously, was not from Boston. This marshmallow is my version of the gigantic, 140-foot tall natural gas storage tank in the Dorchester neighborhood of Boston. Highly visible from Interstate 93, it is a beloved local landmark thanks to Sister Corita Kent's bold streaks of color that cover the tank, commonly referred to as The Rainbow Swash. As a kid we'd drive past and I'd wave at it, now it is waving back.