Each stanza of this poem gives a vowel its own color, as if the letters were seen rather than spoken. A is a shaft of orange light breaking through a gray day. E is an eel-black shape glowing in a green river. I is "winter-pale peach," and the speaker seems to see themselves in it. O is apple-green, and the poem names apple varieties like Mutsu, Greening and unripe Mac to make the shade specific. U, with its capitalized letters in "YoU," is fresh blue and smells of summer clover.
The poem ends on a question about Y, which is "sometimes silver, sometimes jade," just at the edge of what the eye can catch. That fits Y's odd status, since it acts as a vowel only some of the time.
The mood is playful but tender. The images are sensory, drawing on light, scent and the changing seasons. The title suggests the poem is about a person, Megan, so the colors may be a way of describing her, though the poem itself never says so. The ending feels curious and open rather than settled.