This is the fourth part of a series looking at how we should effectively communicate geoscience, based largely on a recent paper by Iain Stewart and Ted Nield. The previous post attempted to address the insanely impossible question of ‘who are the public?’, when it comes to public engagement’. It seems that this is very much a disciplinary issue, each with their own collective suite of hurdles and mountains to climb. The conclusion, I think, was that although identifying various ‘publics’ and sub-categories based on social traits, the use of this is only in identifying some sort of strategic framework for science communication to operate within, when what we really should be doing is ignoring that, and actually going out there and actually doing things. At the recent Festival of Geology in London, I saw kids (and adults!) having a blast playing with robotic trilobites. As a form of communication, I’d say doing practical things like that are infinitely more valuable than discussing which public group the trilobites are trying to commune with (as an example).