Slit-scan/"4th-dimension"

So saw this video oh so many have seen ( http://vimeo.com/1163538 ), thought it was interesting, and tried to replicate it really, really quickly in Jitter.

Here's my quick patch attempt, but it doesn't really work.

Edit: and actually, a moment of searching found this: http://www.flong.com/texts/lists/slit_scan/ via http://processing.org/discourse/yabb2/YaBB.pl?board=Exhibition;action=display;num=1213382538

not quite sure how to go about this, actually...