Bad Kitty Cats Festival of Chaos is coming to CatSynth

We are going to be hosting the Bad Kitty Cats Festival of Chaos here at CatSynth this weekend.

The optional theme is music, art, or technology.

To participate, submit your aticle, submit your post to festivalofchaos at gmail dot com or contact us.


More fun can be found at Weekend Cat Blogging with Kashim and Othello and Astrid.

The Carnival of the Cats is coming this Sunday to Grace and Kittens.

And of course the Friday Ark is at the modulator.

Weekend events in San Francisco (Music, Art and Cats)

Another busy weekend, especially with the number of things going on. We only have time for a partial review…

First, there a quick stop at downtown pub to see some friends/colleagues. Then a rush to BART to get across the bay to Berkeley and my old stomping ground, the Center for New Music and Audio Technologies (CNMAT).

I was a few minutes late, but still had plenty of time to hear Joker Neils and Gino Robair performing a improvised duet. Robair has an amazing talent for getting electronic-like sounds out of acoustic percussion instruments, and did so again on this evening. Neils was primarily using custom synthesizers, both professional instruments as well as circuit-bent toys. We have discussed circuit bending previously here at CatSynth. He brought several well-crafted examples, including Suziki Omnichords with contact-resistance interfaces; and he also brought a tremendous enthusiasm to his performance and to his discussion of circuit bending in between sets.

Also presenting was Rob Hordijk, who designs custom synthesizers (or “works of art” as he described them). Among the technologies he employed in the “Blippobox” that he presented were chaotic oscillator pairs, where two oscillators feed back into one another to create non-linear modulation, and a filter that he called the “twin peaks” filter (presumably because it has two resonant peaks).

Amy X Newburg lent her vocal and electronic-music talents during the presentation and in the second half of the show – readers may remember her from a a recent music festival that we reviewed.

I had some interesting conversions with both Amy X Newburg and Joker Neils following the performances, which is always a nice coda to a concert.


It was another exceptionally warm weekend in San Francisco (I wouldn’t mind it becoming less exceptional), so more opportunities for walking events. First off I finally made the trip to the San Francisco SPCA to inquire about volunteer opportunities and see their much touted adoption center. The cat area featured large rooms, “kitty condos” as well as comfy areas to hide – it actually seemed on par with the “cat resorts” where I looked into boarding Luna. The SPCA is actually a short work away from CatSynth HQ (well, it’s at least short from my perspective).

Another short walk in the opposite direction from CatSynth HQ led to the Yerba Buena Gallery Walk. Open studios and gallery events are pretty regular occurrences, even within walking distance. Plus, there’s often free food and drink. I didn’t see too many things that truly interested me, except for some abstract paintings at 111 Minna that I had already seen during the first Thursday earlier this month. But that doesn’t mean the afternoon wasn’t without its attractions. Some of the galleries, such as Varnish, were in very interesting spaces, such as converted industrial buildings from the early 20th century. A view of Varnish is in the photo to the left. Additionally, some of the sights on a gallery tour aren’t the works of art, but the people viewing them – and this is even more true on a warm sunny day. Finally, I did have a delightful conversation with Jesse Allen at Chandler Fine Art – his very psychedelic/natural works aren’t what I am usually drawn to, but some of them did include abstract representations of cats and other animals and one “wild cat” in particular caught my attention.


More art on Sunday, this time photography. This Sunday was “Pinhole Photography Day” (who knew?) and the RayKo Photo center featured an exhibit, demonstrations, and most notably a ride on the Bus Obscura a school bus converted into a large camera obscura.

The bus obscura toured our South-of-Market neighborhood, providing a unique view via the pinhole-camera images. Small dots of blurry light would suddenly come into focus as a sidewalk or car or storefront.

Because the image were so localized, it wasn’t always clear exactly where the bus was, though every so often a familiar landmark would emerge. The ride was accompanied by live acoustic and electronic music, adding to the experience and making it different from the regular “tours” of our neighborhood.

Weekend Cat Blogging: Wildcats, House Panthers and "erf day"

Luna continues to enjoy her “House Panther” status and all the warm compliments. But this weekend, we celebrate cats both domestic and wild, just as we did last year on Earth Day (or “erf day”).

We start again with the Cat Specialist Group of the World Conservation Union (CSG), but focusing on something positive. They are featuring a study of the jungle cat (Felis chaus) and leopard cat (Prionailurus bengalensis), pictured to the right:

The family Felidae is well represented in India, with 15 species occurring here, making it the richest in cats worldwide. However, except for the large cats the rest figure very poorly in research and conservation policies in the country, probably because of their rarity and elusive nocturnal habits, coupled with cumbersome bureaucratic formalities in studying rare species. Fortunately, in the past few years non-invasive molecular techniques have been introduced in wildlife research in India, which has made small cat research easier.

Another endangered cat of India and Southeast Asia is the Fishing Cat. It is a close relative of the leopard cat, and shares some of the same habitat. However, the fishing cat (not surprisingly) is better adapted to hunting and eating fish, and is an excellent swimmer.

The fishing cat is one of many species featured in The Smithsonian National Zoo's Cat Conservation Project.

Note that these are all “small cats”, which often do not get the attention of the larger cat species, which are of course magnificent and also seriously endangered in many cases. Certainly, the small cats share some of the endearing qualities in appearance to our domestic felines (which are believed to be descendants of African wild cats).

Few wild cats resemble their domestic counterparts more than the Oncilla of South America. However, it seems relatively little is known about this species of cat. According to the CSG, it has never been studied in the wild, and little is known about its behavior or population. However, it is been trapped in the past for the fur trade:

n 1971, 28,000 pelts were counted in Brazilian warehouses, and in 1983, 84,500 skins were exported from Paraguay (Broad 1988)

The Oncilla closely resembles the better known Margay, which inhabits both Central and South America, and is not considered endangered. They are skillful tree climbers, and sometimes referred to as “Tree Ocelots,” taking the name from one of the more well-known wild cats of the Americas.

If you interested in this topic, please visit last year's article, which discusses some of the worlds most endangered cats, including the Iberian Lynx, which continues to be the most endangered in the world, with an estimated population in the hundred. Also, the intriguing little Andean Mountain Cat, illustrated to the right.


And speaking of house panthers…

Weekend Cat Blogging #151 is hosted by Luna's “twin” Puddy, along with Katie of A Byootaful Life.

And that's not all. The Carnival of the Cats is being hosted by the Diamond Emerald Eyes (whose mom created Luna's collage at the top of this article) at House Panthers!

The Bengal Brats may not be “house panthers”, but we still love them. They are hosting the Bad Kitty Cats Festival of Chaos at Pet's Garden Blog.

And lest we forget, the friday ark is at the modulator.

Weekend Cat Blogging: Luna and Geometry

Cats, geometry, mathematics and art have been a theme of late here at CatSynth.

Remember this photo of Luna next to one of our geometric glass tables? Well, Luna seems to quite enjoy spending time in and around it. So there is now quite a collection of photos contrasting her organic shapes with the linear geometry of her surroundings:

We had some more surreal green kitties this past Wednesday. And Luna gets into the “green theme” as well:

And with Earth Day approaching, “green” seems quite appropriate. Of course, it's always green here at CatSynth with Luna's emerald eyes.


Weekend Cat Blogging #150 is being hosted by Mog, Meowza and Cece at Mind of Mog.

The Bad Kitty Cats Festival of Chaos will be held at the Cat Blogosphere.

This Sunday, the Carnival of the Cats will be hosted by Aloyisius at Catymology.

And of course the Friday Ark is at the modulator.

Calculus for Cats and Prime Number Theorem

<I was looking for a quick way to combine cats and mathematics this morning, and came across the book Calculus for Cats.

This is a book for people about to take calculus, and for survivors of calculus who still wonder what it was all about. It gently explains the basic concepts and vocabulary without making the reader ever do a single problem.

Basically, the book draws (quite literally) an analogy between the fluid motion of cats at play (or in pursuit of “prey”) and the concepts and techniques of calculus, which focuses on continuous functions.

We at CatSynth remember calculus fondly as a mathematical pursuit. But number theory is more my thing. Calculus primary concerns itself with continuous functions of real and complex numbers, while number theory deals with discrete entities, like integers. But in mathematics, all things are interconnected. For example, we demonstrated the connection between the gamma function, pi and factorials, combining continuous and discrete concepts.

Consider the function π(x), the prime-counting function. It's a bit unfortunate they chose the symbol π, but it is what it is. Basically, this function counts the number of primes less than or equal to a particular number. For example π(20) would be all the prime numbers less than 20: 2, 3, 5, 7, 11, 13, 17 and 19. So π(20) = 8.

So to calculate π(1000) would one have to literally count all the prime numbers less than 1000, including figuring out which numbers are prime? And what about π(1000000)? Unfortunately, the answer is yes. But there are good ways to approximate the number of primes, using the results of the Prime Number Theorem. Those interested in the formal theorem are encouraged to follow the link, but we will skip ahead to one of the interesting results. One of basic functions to come out of calculus is the natural logarithm ln(x), whose base is the famous constant e. If you don't know about it, go look it up. Otherwise, the rest of this article will not make much sense. One can use ln(x) to build more complicated functions in calculus, one of which is the offset logarithmic integral, or Li(x):

This is one of those functions, like the gamma function, that cannot be expressed without the use of calculus. Turns out, however, that it is a good approximately for π(x), which is very much a discrete concept and quite distant from the continuous motions involved in calculus. The prime number theorem provides the connection.

This article is included in Carnival of Mathematics #31 at recursivity.