Creativity itself is a joyous unlatching. The act of creative imagining, inventing, saying differently, crafting a metaphor or image, then crafting another metaphor or image when you go further or when you revise - all these take whatever you think "is" and make clear that other possibilities exist as well. The sense of possibility, the amplitude and freedom that sense of malleability brings - for me, that cannot help but be joyous.