Fionnáin quoted Play Like a Feminist by Shira Chess
I used Salen and ~~ Zimmerman's definition of play: "free movement within a more rigid structure" 6. If we were to consider the hegemonies and patriarchies of global oppression, it would seem that this definition of play (the notion of getting to move about freely) is precisely what feminist activists hope to gain. Salen and Zimmerman's definition therefore becomes particularly useful when play is combined with activism.
— Play Like a Feminist by Shira Chess (Page 70)
The very beginning before the ~~ is on p69
This quote from a section justifying why play can be serious and leisure is not frivolous in feminist theory.