Driving while blind is cool

June 11, 2007 by Blue Minnow

(Lyrics by ZZ top)

When you’re driving down the highway at night
And you’re feelin’ that wild turkey’s bite
Don’t give Johnny Walker a ride
Cause Jack Black is right by your side
You might get taken to the jailhouse and find
You’ve been arrested for driving while blind

Now just the other night with nothin’ to do
We broke a case of proof 102
And started itchin’ for that wonderful feel
Of rollin’ in an automobile
You could say we was out of our mind
And let me tell you we were flyin’ while blind

Then they had us up against the wall
Hey it’s only blood grain alcohol
And there ain’t no cause for alarm
We ain’t out to do nobody no harm
How could anyone be so unkind
To arrest a man for drivin’ while blind

________

Those damn cops…. fortunately, I had my set of lockpicks with me, and was able to extricate my way from the unfortunate situation I found myself in last Friday after a round of drinks with my mates. Of course, I had to make a number of successive bluff and diplomacy checks in order to get my hands on the police records before they went electronic, and was able to develop a legend that could take the fall for me instead. Unfortunately, I lost my hat. Again. Sigh.

There’s my hat!

June 6, 2007 by Blue Minnow

It was a close call, there.

Whiteboard

June 6, 2007 by Blue Minnow

A handwavy model

June 5, 2007 by Blue Minnow

I present an approach to how one might try to model an evolutionary system. So, suppose we have a manifold, M. Let’s say its Lorentzian (that always sounds impressive). Suppose we have a function, f : M -> R, which represents an optimal quantity. Suppose the “measured” function is g : M -> R, and we have initial data for g along a spacelike hypersurface S. The problem is to determine g, given that there is “evolutionary pressure” for it to converge to f on M, for all points p “timeward” of S.

So, without worrying too much about process, but just waving our hands and invoking “random noise”, we could say there is a forcing vector field, r : M -> TM which acts to “push” g towards f. On the other hand, g has no hope of converging to f if f is varying too much. I.e. if |grad f| > |r|, f will “repel” nearby points ie it will be an unstable fixed point or repellor of some invariant which we are trying to optimise. If, on the other hand, |grad f| < |r|, f will become a stable attractor of the same.

Hence we expect g to converge to f in regions where f is an attractor. This makes sense in the context of biological evolution on earth since local environments tend to be relatively static and not terribly variable. In the context of, say, convergence of laws in a society to some new optimum to adjust to technological change, the process fails because technological change is, at the moment, extremely variable.

Critters!

June 5, 2007 by Blue Minnow

The other day I was idly walking along, minding my own business, when I was assailed by a Giant Caterpillar that was making its way across the path in front of me. So I quickly hid in the shadows as the beast passed, and then warily proceeded onward, to get lunch. Mmm sushi.

The trouble with modern city design

June 3, 2007 by Blue Minnow

Something which I have been thinking idly about recently is really the problem with a great deal of modern cities which is, mainly, the fact that one has to travel miles and miles to get anywhere. Utilities seem way too far spread apart. Suburban sprawl is rife; streets are always clogged with traffic, and hardly anyone walks anywhere at all. Which is really the problem; people seem forced to use vehicles because there is no other real sensible alternative to getting to the places of importance during the course of one’s day, due to time constraints plus the fact that otherwise one might have to travel 20 or 30 kilometres by foot or bike during the day.

This is a problem. Another problem is that, apart from a few notable exceptions, very few people actually walk anywhere during the day, and modern city design is not terribly conducive to taking a stroll. Older cities were very much built quite differently, and were designed to be walked around. For instance, central London and Paris are much like this, as is Venice.

I suppose there is however a sort of inertia of inevitability about the changes, of course. Cities are larger, much, much larger, than they used to be. They are the centres of commercial and industrial activity on a scale that would have been unheard of even a couple of centuries ago. But the fact that cities now seem to be built around the car and for the car, annoys me. Not because I am too poor to afford a vehicle– but because it seems to me that designing things this way is wasteful and unnecessarily aggravating.

Now, the sort of city I would like to live in- it would be a city where necessary amenities were within walking distance of one’s house, or at least within bike riding distance (this is certainly true if one lives in the CBD). It would be a city with a decent rail network. It would be a city with a bicycle path network independent of the road network. (There are examples where some of this is the case, for instance, in parts of Holland, where bike trails, walking tracks, and roadways are all separate. Furthermore, there is capacity for riding one’s “home bicycle” to the station, locking it up there, catching a train, and unlocking one’s “city bicycle” at the other end. In fact, this is what many Dutch people apparently do- a big difference from having annoying people lugging their bicycles onto trains and taking up unnecessarily large amounts of space.)

This dream city of mine, it would be a city where the use of bikes or public transport was incentivised, and use of vehicles discouraged. Of course, a road network would still be necessary, but, in this fantasy city, it would be far more bare-bones, designed for moving things around that absolutely could not be moved in any other way. It certainly would not be the major transportation network the population used!

The advantages seem obvious to me. One advantage is that one should be able to more efficiently commute to and from work, avoiding rush hour difficulties, for far less infrastructure cost. Another would be the fact that one did not have a massive amount of polluting, noisy traffic. Yet another would be the health benefits to the population, who would be forced to be more active and mobile. This in turn would yield mental health benefits (healthy body, healthy mind, according to the mantra).

The only thing a car should be used for, in my personal opinion, is for travel to locations where there is inadequete public transport infrastructure to or from, eg country locations where the population density is too low to make such networks worthwhile.

Eight

May 19, 2007 by Blue Minnow

Eight happens to be the number of Thurston’s model 3 geometries: $R^{3}$, $RP^{3}$, $S^{3}$; $S^{2} \times R$, $RP^{2} \times R$; $S^{1} \times S^{2}$, Nil, and Sol. The fact that there are eight different particle families in the Standard Model is, perhaps, no coincidence in lieu of this information.

Then there is the eightfold path of buddhism, which is supposed to act as guidance to find the middle path- a path that, according to the ethos, supposedly should bring peace, temperance and happiness to the practitioner.  It is perhaps no surprise either that eight is a number considered synonymous with luck and wealth in certain countries in east asia, which is where buddhism arose.

The Octonians are a number system with eight roots of unity.

In Terry Pratchet’s discworld, the eighth colour is the colour of magic, Octarine.

Not to mention that eight is the first cubic number (after one, but that doesn’t really count).

So I think you will agree that eight is a pretty cool number.

Hello world!

May 19, 2007 by Blue Minnow

Welcome to my blog.  Here I essentially aim to discuss various things that I think are cool, relevant and interesting.  Always more to come!