> The only perhaps appropriate eye-candy metaphor would be a stack like a stack 
> of tasks on your desk, but that’s exactly what you want to avoid, and is not 
> easy to swipe to get to. (I assume you can do that? dunno, don’t use it)

        My guess is the metaphor they’re aiming at is that of a filmstrip.  
Though I haven’t used Lion yet, nor even Spaces with Leo or SL - with or 
without a trackpad.  What might be nifty (though of questionable actual 
usability) would be to use a three-finger pinch gesture combined with a 
movement *up* out of the plane of the tablet to simulate, followed by the 
reverse in a different spot on the pad.  The metaphor being that of pulling up 
a sheet and moving over to a different area of a larger “Desktop Space”.  The 
main advantage of something like this would be a way to move from any Desktop 
in a square array to any other - not just the ones directly vertical or 
horizontal from the one you’re at.

        Hardware-wise it would require the pad to have the ability to sense a 
hand-presence in the third-dimension, probably in a way (electrically) similar 
to how a Theramin operates - or have three or four cameras some rather 
sophisticated image processing.  If an effect like this were tied in with a 
suitable-sophisiticated OpenGL-eye-candy..  (slight “crumpling" of the current 
desktop, camera movement and zooming), this might make a reasonable 3D 
interface idea.  Think kine of how Taelon ships were operated in Earth: Final 
Conflict.

Jim_______________________________________________
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