The sky is blue, the air is crisp and the leaves are aflame with gold, crimson and orange.
And the sky is blue, it says, because the sun produces white light which is made up of all the colours of the rainbow.
Folks argue about whether the sun rises in the east and whether it sets in the west, whether the sky is blue. (Laughter.) There's always going to be arguments in Washington.
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But if you hit one of those beautiful winter days when the sea is calm and the sky is blue, continue along the coast path for about two miles until it curves into the hidden bay and tiny old harbour of Lamorna Cove.
This refraction eliminates both the red end of the spectrum (red light is not bent enough by the air layer to form part of the second image) and the blue frequencies (which are scattered away: this selective scattering is why the sky is blue).
The sky overhead is bright blue and filled with the sound of bleating.
The inland sky above Boonville is powder-blue as I enter the Mendocino Fairgrounds for the annual Floyd R.
The sky is still a perfect cloudless blue and the forecasters have dropped their previous prediction of rain by the weekend.
The extraordinary lobby of the palace is centered on a marble fountain supported by cherubs, while the sky-blue walls are frescoed with cotton-ball clouds, birds, garlands and idealized rural scenes.
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The latter idea is about as blue-sky as you can get, but systemic changes are ultimately more powerful than any awareness campaign.
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But a clear, cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more easily than they do red light.
The sky beyond is washed with strokes of cobalt and cerulean blue, and a faint but perceptible smell of aniseed and wild garlic hangs in the air.
But, and here is the limit to such blue-sky optimism, this does not mean that it will be: solvable problems are not always solved.
Clearly intended as a consumer product, the EM-500 is available in five colors: yellow, blue, green, red and sky blue.
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