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petri dishes, and or the idea that burdock burrs could be anything but  annoying, we encounter radical changes in the evaluation of what's  interesting. In the \emph{d\'enouement}, what was initially  unexpected is found to be both explicable and useful. Importantly,  serendipity is not the same as luck. It involves making sense of  something unexpected, in an unanticipated way. Although computational  processes often evolve in unexpected ways  \cite{minsky1967programming}, the bridge from an unexpected discovery  to a useful new invention poses several difficult challenges for  computational modelling.  Van Andel \citeyear{van1994anatomy} -- echoing Poincar\'e's  \citeyear{poincare1910creation} (negative) reflections on the potential 
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programme `serendipity' it cannot be called serendipity  anymore}.'' \cite{van1994anatomy}  \end{quote}  We However, we  believe that serendipity is not so mystical as such statements might seem to imply, and in Section \ref{sec:discussion} we indicate  that ``patterns of serendipity'' like those collected by van Andel  are likely to applicable in computational settings.