Re: LOGO-L> UNDO -- third try

[Chuck Shavit <CShavit@MagicSquare.com>]

Brian Harvey wrote: 

>  I'll think about a history recording feature; that sounds doable.
>  But of course if the recorded history does include state changes,
>  we run the risk of a new mystery for the user not to understand,
>  when the effect of the replaying is not the same as the effect of
>  the original run.

I'm not sure why you include "risk" and "mystery" in the same sentence.
Personally, I view it as a stimulating thinking activity.  Note that it's
the same "mystery" as when you re-run a program and it does not work the
same as before.  I had a most pleasant experience teaching kids to use the
random function (with a "randomized" seed) and seeing their faces as they
learn how to intentionally make their program become unrepeatable.

Chuck
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