Pendulum

[Alan Kay]

Hi Phil --

At 5:38 PM -0400 4/17/03, Phil Firsenbaum wrote:
>Interesting...I actually saw this message on the Squeak archive. i 
>didn't receive it on the mailing list, though.
>
>Anyhow, even if the pen were down and the pendulum simulated reality 
>i think it would draw lines on top of lines  unless the area under 
>the pen was scrolling. Do you see what I mean?

Well, here's a little exercise in relativized thinking ...

Embed a round little object like an ellipse to be the bob of the 
pendulum, call it "bob". Make another little object called "plotter", 
put its pen down. See what happens when you do:

                 plotter's y increase by 1
                 plotter's x <- bob's x

Cheers,

Alan

>I'm still hoping to get the pendulum to work although maybe that's 
>not as important as the thinking about pendulum that I've been 
>forced to do. I think it would be really powerful to get kids 
>involved. We should try it out before the year is out...with 
>something that's doable, or maybe not
>Wouldn't it be nice to have at least a few other teachers involved 
>in this conversation? From PS 87 or from the local PDS? Is there a 
>grant opportunity lurking in here someplace?
>
>Off to a Seder now...enjoy!
>Phil
>
>
>On Wednesday, April 16, 2003, at 07:23 PM, Robyn Ulzheimer wrote:
>
>>So I've been reading all of the emails. I had this idea about using the
>>pen.  When the pendulum was swinging if the pen was down, it would draw
>>the arc.  However, it wouldn't look like the Robolab one (at least not
>>yet) but could it evenutally? Just a thought as I was sitting in traffic
>>on the way home tonite.
>>
>>
>>Robyn


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