Transitions 7 years later

 The problem I tried to solve was this: In between counting, a slide with no counter gets in the middle:




 At least the color matches. So I came up with this:


This is the whole sequence:

All the counter slides have the same structure except for slide number 2 :

This one has two purple square. The back square moves downwards to match the purple column of slide 3:


The elements of slide 3 have only build-in build-out animations/transitions:


This is good because it means that Keynote does all the job. The elements labeled "top" and "bottom" duplicate the background to achieve the revealed effect. 



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