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I wonder whether there is an elegant way to change the x scale labels to symbols, e.g. polygons. Cf. the following figure.

Example figure

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    Should the numbers be in the polygons? Or polygons only? – Heroka Jan 05 '16 at 13:53
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    It looks a bit complicated to me, but [here](http://stackoverflow.com/questions/8905101/how-can-i-use-a-graphic-imported-with-grimport-as-axis-tick-labels-in-ggplot2-u) and [here](http://stackoverflow.com/questions/29939447/icons-as-x-axis-labels-in-r-ggplot2) are two places to start (and are possibly duplicates). Can you add your coding attempt to do this and where you got stuck? – aosmith Jan 05 '16 at 16:44

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