Monthly Archives: November 2015

nightfall

Suddenly it is fall. It has crept up on us. And so much sooner every day it is night. I set out from the office as the golden hour of the sun projects stark fame on the faces of the high-rise apartments, and by the time I am awaiting my bus a kilometre farther south the light comes from the thousand electric fires of street lamps and headlights. The sky aches in iridescent ultramarine and at last surrenders to the… I would say to the stars, but in Toronto they, too, lose to the sodium aura from below. The moon holds its cold throne as duke regent, but all it is able to do is shiver albedo.

Nightfall.

The absolute rule of the sun, the glowing solitary monarch, is suspended. Light comes from this point and that point and the other point. Relativism reigns; the angels of the morning are fled and the opposing angles of evening light fight and play with each other. Shadows are darker. The sun has fallen, and the reign of the day has fallen with it. And with that, the night also falls, like a thick curtain with a frayed fringe.

Night. Fall. Two soft, half-whispering words as old as the language, changed only slightly in form by time, now conjoined. Their first date as a couple is 1611, naming fruit that has fallen from a tree during the night. To mean ‘sunset’, the compound is known from about 1700 in the records of the Oxford English Dictionary. The image is surely older.

But how does night fall? Where does it fall from? As we stand on our planet, if we choose to look away from the setting sun, we see that the darkness is growing on the eastern side. The darkness sweeps up and over the zenith and washes at last down the other side. It is not a fall; it is like a blanket pulled over a dome. Pulled by the fall of a sphere.

Only a blanket has weight, just as things that fall have weight. Darkness may seem dense, but it is really nothing. It is not something that is there; it is the absence of something. It is of no matter; it can be anywhere at any time at any speed. It is not heavy. It is light. The sun is heavy: it sinks.

Light has no weight, of course; if photons had mass they could not move at the speed of light. You can’t be heavy and be light. But you can be heavy and be a source of light; indeed, much light comes from heavy things. Darkness, on the other hand, comes from nothing at all. You may use a heavy thing to stop the light and cast a shadow, but the heavy thing is not sending darkness, it is just stopping light. And then there is nothing: night is naught.

Night hasn’t fallen. It hasn’t risen either. It’s just what’s left when the source of light has fallen. Or been turned away from.

Because of course that’s what nightfall is: earthturn. If you go far enough north, you see it more clearly. In the summer, the sun makes a tilted circle and barely touches the horizon; as the year draws on the circle lowers gradually until it is below the horizon most of the time. In Iceland they don’t say “24 hours a day”; they say alla sólarhringinn, ‘all the sun’s ring’. Sunspin.

We may as well think of the sun as sailing away from us over the horizon. The sun leaves and night is what is left.

The sun is glorious, of course. It fuels life. We would be colder-hearted than Pluto without it. But the sun is a bully, a dictator, a satrap. It gives so much light that other lights can’t compete. The stars don’t come out at night; they’re there all day too, but the sun outshines them… because we are so close to it. On a planet circling a different star, our sun will be just another twitching dot visible in the distance only when the local orb is not. The relativity of night is just what was already there but visually indifferent in the solar onslaught.

Well, what was there plus the lamps we light.

Nightfall is not a falling of darkness but just a revealing of what else was there. But nightfall is a fall. The day is like summer, and the light leaves. Which is to say the light is like leaves, and then like leaves it leaves: it turns yellow and orange and red, and is last seen at ground level. Nightfall is fall. The fruit drops and goes to seed. The night is winter. Dawn is spring. And so we play around the ring.

And once again I await the transit.

ctenophore

One of those mornings. You awaken planked on your bed, your face drained of colour, your tongue sticking to the roof of your mouth. You have clearly consumed too much. When you get up you find that your legs are jelly and you are swimming forward as much by the waving of your hair and flapping of your earlobes as by any limbs. You feel as though your body is almost entirely liquid. One look in the mirror and you know: you’re going to have to carry a comb today. Yes, my friend, you are become a ctenophore.

Ctenophore. From Greek κτενός ktenos ‘comb’ and ϕέρειν ferein ‘bear, carry’. Not that everyone who carries a comb is a ctenophore. No, the word is actually a name for a kind of jellyfish. A small one, plankton-size, measured in millimetres. They move forward by the flapping of lobes and the swaying of cilia (little hairs). Those rows of cilia – eight or more rows – give it the name, since the cilia are short and the rows look like combs. There may be more than a hundred cilia, but note that these are not centophores – actually, cent is from Latin; a proper Greek hundred-bearer would be a hectophore. But these are not that.

Regardless of how opaque their name may seem, ctenophores are transparent and largely colourless. In spite of all that, they are voracious predators. Yes, there are things even smaller than the ctenophores – other little jellyfish, for instance. Read more about them at http://www.ucmp.berkeley.edu/cnidaria/ctenophora.html and http://faculty.washington.edu/cemills/Ctenophores.html .

It may be tempting to think of them as like a c swallowing a t at the start of this word. But surprise! (Or not.) In English, it is the c we don’t say, leaving the word sounding similar to “ten-four”… not quite a hundred, but never mind. But in other languages, the c is said as “ka” or just “k.” Of course they didn’t stick a vowel in there in the original Greek.

We may think we can’t say “kt” at the start of a syllable, but there’s nothing actually keeping most of us from doing so except our beliefs about what sounds we can say where. If you can say “pectin” you can drop the “pe” and just say “ctin,” and if you can say “ctin” you can say “cten.” Never mind that this kind of jelly contains no pectin. Your tongue may feel as though it’s sticking to the roof of your mouth when you say /kt/, but think of this: at least you don’t have any ctenophores in it.

odyssey

What the word odyssey brings first to my mind: the classic Stanley Kubrick–Arthur C. Clarke movie and novel 2001: A Space Odyssey. Starting with the opening bars of Richard Strauss’s Also Sprach Zarathustra. So stirring. So timeless. So cogent.

So brief.

The opening segment is less than 2 minutes long. That’s all most people have ever heard of Strauss’s work. But that’s no odyssey. An odyssey is long and episodic. It is not a single bright sunrise flash. And Strauss’s work is longer, too, over half an hour long. Here, listen to it all:

That is a “tone poem.” It is a poem somewhat as the Odyssey is a poem. A quatrain it is not, nor a sonnet, nor a villanelle, nor a sestina. It is epic. The original Odyssey is a tale of a ten-year journey, a trail of travails with many perilous passages, a detouring tour of possibly more than 8,000 kilometres around the Mediterranean (and to Hades and back) to accomplish a net transit of little over 1000 km by sea (or, now, by road). (I could actually drive from Troy to Ithaca in 3 hours, but that’s the two cities of those names in New York State.)

The Odyssey is the second-oldest extant work of “Western” literature, the oldest being the Iliad. The Iliad tells the story of the Trojan War, ten years of death over one woman. (Helen had “the face that launched a thousand ships”; thus, a Helen is a unit of beauty, that amount of pulchritude sufficient to launch 1000 ships. A millihelen is beauty sufficient to launch one ship. I did not make that up.) The Odyssey tells the story of the return home of one of the surviving Greek “heroes” of the war, Odysseus. His name is of unclear and disputed provenance. It may come from ‘hate’ or ‘struggle’; it may come from ‘wail’ or ‘lament’; it may come from a non-Greek word. It may be a merging of two names and two characters. The Latin version of the name is Ulysses, which derives from the name Οὐλίξης.

In the Odyssey, Odysseus – or Ulysses – makes a dozen stops of various lengths along the way, including enchantment by various women (Circe, Nausicaa, Calypso – with whom he stayed for seven years…), encounters with various monsters, and interference by the usual gods. It ends with his return home to his faithful wife.

It runs more than 12,000 lines of dactylic hexameter, and it begins like this:

ἄνδρα μοι ἔννεπε, μοῦσα, πολύτροπον, ὃς μάλα πολλὰ
πλάγχθη, ἐπεὶ Τροίης ἱερὸν πτολίεθρον ἔπερσεν

Here is the beginning of Robert Fagles’s translation:

Sing to me of the man, Muse, the man of twists and turns…
driven time and again off course, once he had plundered
the hallowed heights of Troy.

Only it doesn’t begin at the beginning. It begins in medias res and makes liberal use of recollections. This is different from how we typically think of an odyssey. Compare a modern odyssey, which begins like this:

Stately, plump Buck Mulligan came from the stairhead, bearing a bowl of lather on which a mirror and a razor lay crossed.

This is the start of James Joyce’s Ulysses, an episodic tracking from start to finish of a single day in the lives of a small set of Dubliners (Stephen Dedalus, Leo Bloom, and at the last Molly Bloom) in a variety of literary styles, a journey of 700 pages in less than 24 hours. It is an epic slog for some readers, although I thoroughly enjoyed it (I had already made it through Finnegans Wake, and Ulysses was a romp after that). It starts at the time of rising in the morning.

And Also Sprach Zarathustra is the start of Kubrick’s and Clarke’s odyssey, which begins with the dawn of humanity. Zarathustra may be the beginning of the odyssey, but it is the end of theodicy. Also sprach Zarathustra means ‘Thus spake Zarathustra,” and while Zarathustra is another name for Zoroaster, the prophet of the ancient dualist religion Zoroastrianism, Strauss’s title is taken from the title of the work by Friedrich Nietzsche, in which Zarathustra is like a photographic negative of the Persian original, dedicated to overturning morality, speaking of the Übermensch, declaring that God is dead. 2001 does not make such a declaration, but rather presents, as bookends in human history, monoliths manifesting an alien intelligence. The eldritch curious liaison is underscored with an even more eldritch Kyrie Eleison by György Ligeti:

Lord have mercy indeed.

An odyssey is a recounting of a long journey, but one that ends with a return home – not a home that is unchanged, but a home nonetheless. The protagonist in 2001 ends on Jupiter, living through stages of life in a sterile isolation in a series of mere moments of flash forward, but finally becomes a star child, a new being, gazing at the Earth. Ulysses ends with Molly Bloom remembering the day she said yes to Leo Bloom. The Odyssey ends with Odysseus returning to his long-faithful wife and slaughtering her impertinent suitors. Other stories follow a similar arc, for instance Ibsen’s Peer Gynt.

But storytelling, so detailed in recounting the past, has its limits with the future. 2001 was released in 1968, 33 years before the time it foretold. That future is now past. If space exploration had continued on the course it was on at the time, we might well have had a moonbase and a large space station and regular service from Earth to them. We had other things instead, things that may or may not have been any better.

When we retell an odyssey, the episodic travels and travails of a hero over a long time, we retell it in retrospect. We have returned home. Those who do not return do not get to recount their odysseys. When you embark on an odyssey, you don’t truly know whither you will go and whether you will return; you do not know if it will finish as an odyssey. You simply set sail… or take your protein pills and put your helmet on.

This is post number 2001 on Sesquiotica. It has been an interesting journey of a bit more than 7 years so far. And yet I’m always just beginning.

albedo

Look at these trees. They exhibit a pleasing play of shadow and light: shadows on the right side, light on the left – a nice moderate light, glowing.

Now look at the buildings behind them. Look at where the light is. Look at the direction the shadows are going in.

The sun is to the right. South-southwest. This is Bryant Park in New York on an October afternoon, and we are facing east-southeast toward the New York Public Library (remember, Manhattan is not truly north-south). The bright side of the trees is the one away from the sun. The direct sunlight is blocked by buildings on the right: just shadows there. The soft glow is thanks to light reflected from buildings on the left.

When I first stopped to think about that fact – how the bright side of the trees was from reflected light – I thought something like “Well, I’ll be…”

I’ll be what? I’ll be doggoned? No. Albedo.

Albedo. Take a moment to reflect on that word. It takes all its time to reflect on you… and on everything else. And from everything. You included.

The sun gives light: as it burns it releases photons. If you stand in the sun, you stand in the path of a small, small wedge of those photons. They don’t make it through you. Some are absorbed; some bounce back off. The number and nature of those photons bounced back depends on the colour of your skin and clothes. If you are wearing a blue shirt, it keeps most of the photons that aren’t blue, and bounces back – gives away – more of the blue ones. This is how we have colour: surfaces keep the colours they don’t show and give away the ones they do show.

Meanwhile, the space behind you, including the back of your head, is not in utter darkness; it is lit by photons reflected off other surfaces – and diffused by bouncing on molecules in the atmosphere.

Albedo is the percentage of light a surface gives away – doesn’t keep. A surface that kept all the light would have an albedo of 0 and would be perfectly black; a surface that reflected it all would have an albedo of 1 (i.e., 100%). The reflection can be directional – as with a mirror – or diffuse – as with paper. Highly reflective but not perfectly flat or even surfaces give a mottled light.

The word comes from Latin albedo ‘whiteness’, from albus ‘white’. You will recognize the root from abumin and albino and Albus Dumbledore (which, in full, means ‘white bumblebee’). Albedo was first applied to the reflectivity of surfaces by Johann Heinrich Lambert in 1790. An important current usage is to refer specifically to the reflectivity of celestial bodies – such as the earth.

It is also important for environmental science. Snow, for instance, has a high albedo, but once it starts melting and the water runs away, more and more dirt and dark matter is left, giving a lower and lower albedo, which means it absorbs more and more solar radiation and melts faster and faster. The glaciers of Greenland are currently demonstrating this, and it is a matter of some concern. It becomes an accelerating self-destructive cycle of selfishness, as it were.

Separate albedo can be calculated for each wavelength. Some people have suggested that since a blue surface keeps the light that is not blue and gives away the light that is blue, its real nature is not blue. I do not agree. As you go through life, you receive love and hurt, joy and anger, comfort and pain; you do not give all of it back to the world, but only those things that you wish others to receive. A person who receives hurt and joy but gives only joy to others is not a person whose nature is hurt. We do what we want to do and what we are able to do. Our character is our able-do; it is our albedo.

And in the darkest moments of our life, when the sun seems blotted out, there is still light: the albedo of others.