Shel Raphen's poem is a tiny snapshot of a moment most of us have probably had without stopping to think about it: sunlight comes through a bathroom window, hits the water droplets floating in the steam, and a rainbow appears. The poem doesn't dress this up. It simply sets the scene in four short lines and lets the last one, "A rainbow," land on its own.
The speaker never says how they feel, but the feeling comes through in the way the poem is built. The plain, almost casual description, followed by a pause and then that small, bright payoff, suggests surprise and quiet delight. The phrase "in my shower" is worth noticing. It places something magical in a very ordinary, private spot, which makes the discovery feel like a little gift.
The mood is calm, light and gentle. The poem suggests that beauty doesn't have to be found somewhere grand. Sometimes it turns up in the middle of a routine morning, if you happen to notice it.