This and Prezi and many other infinite zoom tools are a little intimidating to me ... too much choice. I like "Paper by 53"'s solution to zooming, finite zoom

This and Prezi and many other infinite zoom tools are a little intimidating to me ... too much choice. I like "Paper by 53"'s solution to zooming, finite zoom levels that it snaps too. They only use 2, but for an app like this, maybe just limiting it to 5 or 4 or 3 zoom levels could provide a backbone of structure for creativity. It helps in 53's case that it's pinching, but I think the same "finite zoom levels that are snapped to when you let go" could work with a mouse too. It also helps them that zooming further "out" goes into the app itself, first showing properties of the current document, then going up to a "list of lists of documents". This pattern could be followed on desktop, but is unexplored. "Snapping finite zoom levels" I'm sure others must have done in some apps before? I just can't think of any.