Desktop interface plugin developed from 2011 by Oliver Hamann has a file management system which requires zooming in and out the folders you wish to access - video embedded below:
Eagle Mode is an advanced solution for a futuristic style of man-machine communication in which the user can visit almost everything simply by zooming in. It has a professional file manager, file viewers and players for most of the common file types, a chess game, a 3D mines game, a netwalk game, a multi-function clock and some fractal fun, all integrated in a virtual cosmos. Besides, that cosmos also provides a Linux kernel configurator in form of a kernel patch.
By featuring a separate popup-zoomed control view, help texts in the things they are describing, editable bookmarks, multiple input methods, fast anti-aliased graphics, a virtually unlimited depth of panel tree, and by its portable C++ API, Eagle Mode aims to be a cutting edge of zoomable user interfaces.
Eagle Mode is distributed under the GNU General Public License version 3.
There are versions for Windows, Mac, and Linux (and possibly one for Android too).
You can find out more at the project’s website here