A question opens the poem, and it is an honest one: "I wonder what it is about girls that look like broken glass / Seem a little kinder than the rest." The speaker has no answer yet. They have only noticed that the girls who look cracked tend to be gentler, and to shine brighter, than the ones who look flawless. The rest of the poem tries to explain why. The explanation turns a small piece of physics into a way of living: a broken surface can bend one beam of light into many colours, and people who carry cracks have learned to do the same with whatever light comes their way.
The central contrast is between glass and porcelain. Porcelain is the prized, smooth, unmarked material, and the speaker's phrasing is sharp about it: "the ones made of porcelain and no cracks." Flawlessness is treated as if it were an ingredient, so that the absence of cracks is all these girls are made of. Glass, by contrast, is something light passes through. The line breaks add a small surprise. "Why they shine brighter" stops short, and only the next line supplies the comparison, so we expect the damaged ones to lose before we learn they win.
The second stanza is where the poem gets its title. The speaker softens into "Maybe," a guess rather than a rule, and then chooses two telling words: the girls have "learnt the art of prism light." "Learnt" makes brokenness a skill instead of an accident, and "art" makes it a craft. Even the word "distorted," which could be an insult, becomes the source of the effect, because the angled, uneven faces of a shard are what split the light. The phrase "at the right angle" admits that this doesn't happen automatically. It depends on where the light comes from and from where it is seen, a hint that these girls need to be looked at properly to be seen at their best. The sound supports the idea, since "light" at the end of one line is echoed by "right" in the next.
The form is loose, with no rhyme scheme and no steady metre. The opening line sprawls across fifteen syllables, like a thought spoken aloud before it is tidied, while "Why they shine brighter" is clipped to five. There is one comma in the whole poem and not a single full stop, so the thought never quite closes. The stanzas shrink as they go, from four lines to four, then three, then one. That last line sits alone and indented, as if the poem were stepping back to let it be heard.
One quiet change in wording is easy to miss. In the first stanza the girls only "look like broken glass." By the third they are "Girls that are like broken glass." The simile moves from appearance to identity, and by then the poem has earned the right to call that identity "So beautiful." That phrase is left on a line of its own, so the word "beautiful" gets a pause before the poem moves on.
The final line, "They know that light is what you make of it," is the only place the poem says "you." Until then the speaker has been observing; now they turn and address the reader. "Know" echoes the earlier "learnt," so what began as a skill becomes wisdom. The line is plain and proverb-like, and deliberately open, since "light" could mean luck, joy, attention, or even pain. Whatever it is, the poem insists that the one who receives it has a say in what it becomes.
What makes the poem worth reading is that it avoids the usual story about broken things. Nothing here is mended, glued or made whole. The cracks are not a problem to be fixed before the girls can shine, because they are how the shining happens. For a short poem in simple language, that is a generous idea. It tells anyone who feels cracked that the damage and the brightness may not be separate things, and it never pretends the girls are anything other than what they look like.