Four short lines carry a whole small story of defiance. The poem sets up a "grey world," a place that feels dull, flat, and maybe a little oppressive. Then comes the surprise: "they," whoever they are, "dared" to bathe in rainbow. That one word, "dared," tells us that choosing color isn't casual here. It takes nerve, as if brightness might be frowned on or punished in a place so used to grey.
The speaker seems to look on with admiration rather than join in. There's a quiet awe in how the image is framed, since bathing suggests soaking yourself completely, not just glancing at color from a distance. The mood is hopeful but tender, with a small spark of rebellion. The poem's brevity makes the contrast hit harder: grey fills the first line, and rainbow lights up the last. It leaves us with the sense that joy, even in a drab setting, is an act of courage.