I found this through my thesis research and found it was worth sharing:

This is ‘play’ as the great philosophers understood it: the
experience of being an active, creative and fully autonomous
person. The play ethic is about having the confidence to be
spontaneous, creative and empathetic across every area of your
life – in relationships, in the community, in your cultural life, as
well as paid employment. It’s about placing yourself, your
passions and enthusiasms at the centre of your world.

P Kane, ‘Play for Today’ in The Observer,see also his book P Kane, The Play
Ethic: a manifesto for a new way of living (London:Macmillan, 2004)