Mar 08 19:47

Crystal Objects New Web Site

Crystal Objects is getting a face lift.

The site is being rewritten using drupal an open source content management system (CMS).

Feb 16 17:44

Safari and the LCSI Plugin - Update

I hadn't tried the LCSI plugin for some time and when I did I discovered it still wasn't working in Safari. So I sent an email off and received a quick reply informing that the plugin isn't 64 bit capable yet but if I started Safari in 32 bit mode it would work.

Search Aperture albums for a specific image

This is an Applescript which searches for the currently selected image in all albums in the current library. The albums that contain the image are displayed in a list and the user can select one of the albums to display.

Mar 26 10:16

LCSI Web plugin and Safari 4

Just tried the web player plugin from LCSI in Safari 4 public beta and found that it doesn't work. Sent email off to LCSI and they confirmed this.

As Safari 4 is a beta release they don't intend to do anything more at this time except to monitor the situation and wait and see what happens.

In the meantime Safari 3 is still ok and of course there is always Firefox.

Mar 11 16:33

Mandelbrot Images

In August of 1985 Scientfic American, published an article by A. K. Dewdney. The article appeared in that months Computer Recreations column.

The column was about Mandelbrot sets; how to generate them on a personel computer. At the time I was programming for a law firm in New York City and we had just received Apple LaserWriter printers with that brand new technology, PostScript. The article gave me a reason to learn PostScript and so I went about coding up the program and producing wonderfull images. Of course they were grayscale but still there was something very compelling about them.

A lot of time has past since then. Recently while going through some boxes I ran across that issue of Scientfic American and of some of the printouts I had made. I decided to rewrite the program now that I had color capabilities. I wrote a version in Smalltalk and another in Logo. Both programs ran much to slowly to be of real use so I decided to give Java a try. Bingo! The data files were produced in a resonal time.

The program to draw the images is written in MSWLogo. There are a number of features in the program that make it easy to manipulate and save the images.

Now available for download!

Both programs are available to anyone who would like them. Be forewarned however that there is minimal documentation. Your best bet to understanding the program is to get a hold of the 1985 issue of Scientific American. Also note the Java class file requires that Java be installed on your machine. Because the program needs to write the data file it is not possible for the program to run as an applet in the browser. You could just run the MSWLogo displayer with the data files that are available. If enough people do this I may make other data files available for download.

Logo microworlds

LOGO is the computer language designed for learning, Here are MicroWorlds projects you can run from your browser links to other LOGO sites, books and other information teachers, parents and kids will find informative and fun.

If you are new to LOGO you should visit

What is Logo? by the Logo Foundation
Why Use Logo? An Overview of Logo in Education by Terrapin Software

Note: These documents will open in a new browser window.


  • The Logo Users Ring.
    The Logo Users Ring is a webring of sites dedicated to the Logo programming

  • Logo Foundation
    If you arrived here by following their link you know what their site
    is all about. If you arrived here via some other route then you should
    check their site out. It's a good place to order software and books, to
    get general information about logo plus they have a lot of great links.
    (Hey, they linked here right!)

  • StarLogo
    StarLogo is a specialized version of the Logo programming
    language. It is a programmable modeling environment for
    exploring the workings of decentralized systems -- systems that
    are organized without an organizer, coordinated without a
    coordinator. With StarLogo, you can model (and gain insights
    into) many real-life phenomena, such as bird flocks, traffic jams,
    ant colonies, and market economies. Turtles, Termites, and Traffic Jams by Mitchel Resnick the developer of StarLogo makes a great introduction to and user manual for StarLogo.

  • MSWLogo
    George Mills' wonderful WIN95 port of Brian Harvey's UCBLogo.
    Full featured Logo plus the ability to create Windows from within Logo. Oh and by the way its free.

  • Going in Circles
    A way to think about circles. Requires the plug-in from LCSI.

  • Logo list server
    The Logo disscussion group is now located at yahoo grpups.
    To join visit the site.