#Spiral(s) #SpiralModel

“We shall not cease from exploration

And the end of all our exploring

Will be to arrive where we started

And know the place for the first time.

Through the unknown, remembered gate

When the last of earth left to discover

Is that which was the beginning;

At the source of the longest river

The voice of the hidden waterfall

And the children in the apple-tree

Not known, because not looked for

But heard, half-heard, in the stillness

Between two waves of the sea.

—T.S. Eliot, from “Little Gidding,” Four Quartets (Gardners Books; Main edition, April 30, 2001) Originally published 1943.”

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Above Wikipedia and Wikimedia Commons image is from the user Chris 73 and is freely available at //commons.wikimedia.org/wiki/File:NautilusCutawayLogarithmicSpiral.jpg under the creative commons cc-by-sa 3.0 license.

https://en.wikipedia.org/wiki/Chambered_nautilus#/media/File:NautilusCutawayLogarithmicSpiral.jpg

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The Chambered Nautilus

BY OLIVER WENDELL HOLMES SR.

This is the ship of pearl, which, poets feign,

Sails the unshadowed main,—

The venturous bark that flings

On the sweet summer wind its purpled wings

In gulfs enchanted, where the Siren sings,

And coral reefs lie bare,

Where the cold sea-maids rise to sun their streaming hair.

Its webs of living gauze no more unfurl;

Wrecked is the ship of pearl!

And every chambered cell,

Where its dim dreaming life was wont to dwell,

As the frail tenant shaped his growing shell,

Before thee lies revealed,—

Its irised ceiling rent, its sunless crypt unsealed!

Year after year beheld the silent toil

That spread his lustrous coil;

Still, as the spiral grew,

He left the past year’s dwelling for the new,

Stole with soft step its shining archway through,

Built up its idle door,

Stretched in his last-found home, and knew the old no more.

Thanks for the heavenly message brought by thee,

Child of the wandering sea,

Cast from her lap, forlorn!

From thy dead lips a clearer note is born

Than ever Triton blew from wreathèd horn!

While on mine ear it rings,

Through the deep caves of thought I hear a voice that sings:—

Build thee more stately mansions, O my soul,

As the swift seasons roll!

Leave thy low-vaulted past!

Let each new temple, nobler than the last,

Shut thee from heaven with a dome more vast,

Till thou at length art free,

Leaving thine outgrown shell by life’s unresting sea!

https://www.poetryfoundation.org/poems/44379/the-chambered-nautilus

https://www.bbc.com/culture/article/20220318-the-ancient-enigma-that-still-resonates-today

https://en.wikipedia.org/wiki/Spiral

https://en.wikipedia.org/wiki/Spiral_model

https://medium.com/@chandu_22532/spiral-model-spiral-model-in-software-engineering-64e0ddee5269