Humor can be very important to creativity. (Greenwood-Robinson, Maggie, PhD. 20/20 Thinking. p 368. NY: Avery, Putnam Special Markets, 2003.)
Humor releases tension, can increase creativity, and can lead to perceptual flexibility. The concepts of creativity and change are closely related to each other, as well as to humor and learning. Humor seems to increase the a ility to think creatively. (Schwartz, Enid A., RN, MA, MC. Infusing Humor into Healthcare. p 78, 91. CE Express.)
Refer to Creativity and the Brain for additional information.