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#1 Arrange sequential nodes so that nested images are aligned at one EDGE (say, v-sized angle seems to fill screen, anchored at bottom, zooming out to V-sized view of same angle), and have the animation keep the shared (bottom) edge steady. (As it is, the smaller image drops briefly out of view during the animation because of the "zippy bounce" effect.)
#2 Arrange sequential nodes along an arc (perimeter of circle graphic), and have the animation keep the arc placement steady. This would greatly reduce the "seasick" feeling associated with rotation. (People don't get seasick when they have a visual window on 25% of a gradually turning dial, as in Wheel of Fortune, but they do get disoriented if it's turning AND changing size AND changing the location of its center -- or, of course, if they make their eyeballs track one point on the spinning periphery.)
In general, the little "zippy bounce" effect along every bit of path (even between same-size nodes) is a bit too cutesy for me sometimes. (In other words, the visual window always runs ahead with its positional orientation before catching up with its magnification adjustment.) Just allow the option of a steady pan and zoom (even as an overall preference to start), and that should solve problem #1.
The #2 issue would require the above fix PLUS the ability to specify the path of the path (as it were). At first you might limit it to straightforward lines and curves, or simply let me opt into WHATEVER curve efficiently corresponds to the change in rotation between nodes. Following a bezier (say, a spiral path along which to zoom, or having the effect of navigating a maze) would be especially lovely, but clearly not necessary for just getting prezi to feel more visually stable.
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