What is the tone in the poem One Today?

I'm having a hard time recognizing the tone in the poem, "One Today" by Richard Blanco. Also what does "a story told by our silent gestures" mean?

"One Today"

One sun rose on us today, kindled over our shores, peeking over the Smokies, greeting the faces of the Great Lakes, spreading a simple truth across the Great Plains, then charging across the Rockies. One light, waking up rooftops, under each one, a story told by our silent gestures moving behind windows.

My face, your face, millions of faces in morning's mirrors, each one yawning to life, crescendoing into our day: pencil-yellow school buses, the rhythm of traffic lights, fruit stands: apples, limes, and oranges arrayed like rainbows begging our praise. Silver trucks heavy with oil or paperâ€Â" bricks or milk, teeming over highways alongside us, on our way to clean tables, read ledgers, or save livesâ€Â" to teach geometry, or ring-up groceries as my mother did for twenty years, so I could write this poem.
The poem continues

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