In Native American culture, there's a concept called "the hollow bone".
After the invention of cooking, our ancestors had way more time on their hands. Time to make fun stuff like musical instruments. They started making flutes out of bones.
When the bone was hollow, clean, and dry, the sound emitted was beautiful.
On a practical level, what does this mean for your creativity?
Working feels better when you're emptied out of anxiety, self-loathing, fear, and willfulness.