He caught
The sunbeam striking through that bullet-hole
In his closed shutter--a round white spot of light
Upon a small dark screen.
He interposed
A prism of glass. He saw the sunbeam break
And spread upon the screen its rainbow band
Of disentangled colours, all in scale
Like notes in music; first, the violet ray,
Then indigo, trembling softly into blue;
Then green and yellow, quivering side by side;
Then orange, mellowing richly into red.
Then, in the screen, he made a small, round hole
Like to the first; and through it passed once more
Each separate coloured ray. He let it strike
Another prism of glass, and saw each hue
Bent at a different angle from its path,
The red the least, the violet ray the most;
But all in scale and order, all precise
As notes in music. Last, he took a lens,
And, passing through it all those coloured rays,
Drew them together again, remerging all
On that dark screen, in one white spot of light.
So, watching, testing, proving, he resolved
The seeming random glories of our day
Into a constant harmony, and found
How in the whiteness of the sunlight sleep
Compounded, all the colours of the world.
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