The wheelbarrow glazed with rain might intend that the narrator is speaking about a day without work (responsibility lightened). Therefore, the freedom that one yearns for has arrived. That weight lifted. And the result is a release of newfound energy.
This shared bit of expectations, yearning might settle well and universally connect with the reader.
That such a short piece should accomplish such a delicate and precise connection with the reader is perhaps unique to poetry. The brevity accomplishing much with so much speed and deftness.
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