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Pictured above is a screen capture of Intersections 2, a flash sketch by interactive designer Jonnie Hallman. Launching this mini-application yields a simple workspace that contains three adjustable circles. Each of these circles has a pair of white sliders (vertices) that allow you to pivot and scale the entity. You can also create new points with which to generate vectors that run across the canvas. This all sounds simple enough, but what is so engaging about this application is the manner in which the interface tracks the interaction between geometric entities. Each intersection is represented by a yellow marker that highlights the point in question - if you pivot a circle "through" another, the point(s) of contact will slide along to trace the movement. Modulating the arrangement of these shapes feels like calibrating an abstract instrument of some sort. This experienced is no doubt enhanced by the sharp visual language of the piece.

Jonnie Hallman has a variety of experiments, including more "intersection" pieces in his archives. Hallman also authored the recent DestroyFlickr application, which is a widely noted alternative interface for the photo-management service.