I have developed and published a sample world that illustrates the approximate trajectory proposed by Scarlet at
http://www.alice.org/community/showthread.php?t=990
To make things interesting, I used the approximate trajectory in a short animated parody of the old Game of Life. The world tells the story of a colony of animated bugs that live next to a colony of other creatures. The interesting part is the interactions between the bugs and the other creatures. Because I don't want to spoil the ending, that's all I will tell you. You will need to download and play the world to get the rest of the story.
Download a zip file at
http://www.dickBaldwin.com/alice/alice0930.zip Extract and play the file named
JumpingFish01.a2w Watch the animation carefully to make certain that you don't miss the action.
Dick Baldwin
Free Alice tutorials:
http://www.dickbaldwin.com/tocalice.htm
Free programming tutorials:
http://www.dickbaldwin.com/toc.htm