Sand from the base of Eureka Dunes

Desert sand has sharper edges than water-tumbled beach sand.

More exotic sand photos at sandcollectors.org.

This is the most pronounced cloud shadow I’ve ever seen. The cloud in question appears to be the bright white streak near the horizon, which is almost but not exactly lined up with the shadow. But why
the strange alignment of the original cloud? It could be a contrail, but it’s very thick and fluffy and seems to start very suddenly.

The shadow stretched halfway across the sky.

Sometimes people refer to time as a “fourth dimension”, which is true in some sense but also misleading since time is qualitatively different from the three spatial dimensions. You can rotate an object so its height becomes its length or width, but in the real world you can’t rotate duration into depth.

MoFrames is a collection of images that do just that. The image on the right was constructed from a video of two swing dancers, with the background removed and each video frame shifted slightly forward and overlaid using a piece of software called Recreating Movement. The MoFrames site contains more examples including a page of videos that play with time, space, and motion in unusual ways.

(via kottke)

See also Golan Levin’s list of slit-scan video art and research.

Here’s a nice year-long timelapse for the new year. You may prefer to watch it in high-def.

One technique I haven’t seen before is the use of tone mapping to prepare each frame. Tone mapping is usually used to compress high dynamic range images so that they can be displayed on a standard computer monitor. You can’t show the the absolute brightnesses in an HDR image, but through tone mapping you can preserve the relative brightnesses.

For timelapse purposes, what tone mapping does is hide some of the variation in lighting conditions between frames. This means that you don’t get unpleasant flickering in the video when a dim, cloudy day is followed by a bright sunny day. Shadows still appear and disappear across frames, but this is a clever way to preserve the same overall brightness.

Maybe I’m just late to the party, but the current interest in scent seems to trace back to a single individual: Luca Turin.  It started when Turin and Tania Sanchez wrote a book of inscrutable but hilarious perfume reviews. Chandler Burr then wrote a book about Turin and Turin’s controversial theory about the mechanism of smell, and parlayed that into a job as the first ever perfume critic for the New York Times.

In response, Avery Gilbert wrote a less than complimentary review (pdf) of Burr’s book and Turin’s science, which led to a full-length book about the science of smell. Gilbert is occasionally pedantic - there are twelve pages devoted to debunking Proust and his fans. But What the Nose Knows is - title notwithstanding - the best popular science book on scent that I’ve read so far, if you’re interested in the experimental evidence anyway.

Now, a fast-food chain is running a viral marketing campaign using perfume as the hook, and Dr. Gilbert has taken the opportunity to write a snarky Burr/Turin/Sanchez style review of Eau de Hamburger. Excerpt:

Flame’s topnote unfolds like a prepubescent Asian contortionist climbing out of a crate of overripe Algerian pears. The bold viande accord in the heart introduces itself with solid, yet suave confidence—it’s Richard Gere on steroids. Boisdur delivers a signature touch with a trace of instantly recognizable isopropylparabenzyldicaproic acetate. The effect is stunning: like spare ribs slow-cooking on a Weber E-210 at a Section C tailgate party in the Meadowlands. The drydown is long and satisfying.

Fifteen years ago the only book I found on smell was Max Lake’s somewhat lascivious Scents and Sensuality, which was interesting but not exactly confidence-inspiring. Good times for olfactory aficionados - thank you Dr. Turin.

One of the more intriguing aspects of perfumery is the evolution of scent over time. The more volatile components of a mixture (”top notes”) predominate at first, and as they evaporate off they give way to the slower and heavier components of the scent (”base notes”).

I’m very new to perfumes, but so far I am finding myself fascinated by the complexity of the initial scents and bored by the long and relatively simple finishes. For example, Christopher Brosius describes his Violet Empire: “the violet scent perpetually peeps out from behind a shining green veil.” Indeed, out of the bottle it smells fantastic. On skin, the shining green veil soon dissipates and what remains seems floral and cloying, though a better nose than mine describes the finish as “deep woods and a mild trail of leather“.

Contrast this with the development of a piece of music - many pieces start with a simple exposition of a theme, slowly building in complexity as the vocabulary gets established. This is most obvious in a Hindustani classical performance, which begins by slowly exploring the intervals of a raga within a single octave, juxtaposing only a few notes at a time and letting them fade before sounding new ones. Gradually the surrounding octaves are added to the mixture, and the soloist accelerates until many tones are ringing at once. It might take ten minutes before any rhythm is introduced, and another twenty before the fireworks really get going.

A perfume seems more like a single stroke of a gong - rich and complex when first struck, but settling down to a persistent hum. But while a gong lasts a few minutes at most, the base notes of a perfume persist for hours.

Wine tasting allows another approach - you get to take that journey from start to finish on each sip, as well as noticing the slower changes over the course of several glasses. However, wines have a much more constrained palette than what the perfumers work with.

The slowest change in scent I’ve ever observed took years, and was probably a chemical change rather than the gradual evaporation of volatiles. I picked a flower in Marin county - something like Artemisia Californica, but with perfect small silver-gold everlasting flowers. The sage smell lasted for months, fading to a distinct smell of maple syrup. After two years the maple scent was replaced by an increasingly powerful whiff of dried urine. It took a while to figure out where the odor was coming from, but I regretfully got rid of the flower.

Aspen Palette - Lake Sabrina, September 24 2008

Leaves collected near Lake Sabrina in the Eastern Sierras (at about 9200′ elevation). Arrangement inspired by Andy Goldsworthy, of course.

The orange/peach colored leaves are new to me - in Colorado and New Mexico I’ve only seen the golden yellows.

Guidance for next year: California Fall color reports - Fall color updates for the Eastern Sierras

Git is an extremely powerful tool for file sharing and version control. Unfortunately it is too flexible for most uses - you need to construct a workflow for your particular usecase, and if you screw things up you may need an expert to help you recover.

I decided that Git was the right tool for maintaining nixweb.com, and ran straight into an undocumented use case.  So here I describe the setup and workflow I use for the site, in the hope that it may be useful to somebody. I assume basic familiarity with Git and Ssh.

(more…)

I recently learned about San Francisco artist Leslie Shows, and went to check out some of her work at the Bay Area Now 5 show at YBCA.

The Arrangement of Salts and Metals by Properties / 48”x 72”, collage & acrylic on wood, 2005

Her work is largely inspired by natural landscapes - mountains and lakes, clouds, icebergs. The landscapes often suggest the impact of human exploitation - unnaturally flat rock faces or terraces hinting at quarries, streaks of lurid color in the waters reminiscent of mine tailings. Mixed in with the ink and paint there may be cutouts of gold jewelry or other extracted wealth. Lots of detail, very much worth seeing in person.

Apparently she grew up in Alaska.

Oddly enough the images that got me interested in this local-to-me artist came from London blogger Rodcorp. More of Ms. Shows’s work is showing at Headlands Center for the Arts in Marin, until December 7 2008.

As part of the site redesign for nixweb.com (formerly nixfiles.com), I’m starting a blog.  As far as I can tell, the advantage of the blog format is that it sorts everything by time.  So, feed.nixweb.com is for repeat visitors, while nixweb.com is for people who are just curious.

This is an experiment. I might as well admit that I don’t know what I’ll be posting here.

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