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One reason for this omission may be that the field of computational  creativity has tended to focus on artistic creativity, conceptualised in such a way that creative outputs are largely under the direct control of the creative agent. However, serendipity is increasingly seen as relevant within the arts  \cite{mckay-serendipity} and other enterprises, where it is encouraged with methods drawn from fields ranging from architecture to data science \cite{kakko2009homo,engineering-serendipity}.   There is particularly interesting potential for serendipity within computational systems whose processes involve interaction with users\footnote{It should not be assumed, of course, that a system that can accommodate user interaction would directly lead to serendipity; take for example the use of a calculator, where potential for serendipity through user interaction is (at the greatest stretch of the imagination) minimal at best.}  %  An interdisciplinary perspective on the phenomenon of serendipity  promises further illumination. Here, we consider the potential for  formalising this concept. This paper follows and expands \citeA{pease2013discussion}, where many of the ideas that are developed here were first presented. The current paper reassesses and updates this earlier work, developing it towards a computational characterisation of serendipity for computational modelling and evaluation. New claims are advanced, positioning serendipity as a fundamental concept in computational creativity, with exciting potential to play a key role in computational intelligence more broadly. There is particularly interesting potential for serendipity within computational systems whose processes involve interaction with users.\footnote{It should not be assumed, of course, that a system that can accommodate user interaction would directly lead to serendipity; take for example the use of a calculator, where potential for serendipity through user interaction is (at the greatest stretch of the imagination) minimal at best.}  Serendipity is itself centred on reevaluation. For example, a  non-sticky ``superglue'' that no one was quite sure how to use turned  diff --git a/serendipity.tex b/serendipity.tex  index 73945b9..bb6b5b9 100644  --- a/serendipity.tex  +++ b/serendipity.tex 
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