Creating and designing with a machine: do we merely create together (co-create) or can a machine truly foster our
creativity as human creators? When does such co-creation
foster the co-creativity of both humans and machines? This
paper investigates the simultaneous and/or iterative process
of human and computational creators in a mixed-initiative
fashion within the context of game design and attempts to
draw from both theory and praxis towards answering the
above questions. For this purpose, we first discuss the strong
links between mixed-initiative co-creation and theories of
human and computational creativity. We then introduce
an assessment methodology of mixed-initiative co-creativity
and, as a proof of concept, evaluate Sentient Sketchbook as a
co-creation tool for game design. Core findings suggest that
tools such as Sentient Sketchbook are not mere game authoring systems or mere enablers of creation but, instead, foster
human creativity and realize mixed-initiative co-creativity.peer-reviewe
