It’s rare, of course, but not unheard of. This recent case from China:
…reminds me of the last time I visited this subject, thanks to Shelley at Retrospectacle (now defunct), when the muse was a… unique… knitting project.
“Teratoma”, or “Knit me a Sister”.
“I have an invisible friend”, I said,
“But she doesn’t hide beneath my bed,
Or in my closet–no, instead,
I keep her tucked inside.”
“We do not mean to condescend,
But we all know, there’s no such friend;
This fabrication now must end.”
My Mom and Dad replied.
“But Mommy! Daddy! Please, I swear!
She’s closer than my teddy bear!
See my tummy? She’s in there!
I even feel her growing!”
My parents didn’t scream or shout;
They trusted me, despite their doubt,
And had a doctor check me out
When something started showing!
My friend was real! I hadn’t lied!
At first, my twin, but then she died.
The doctors cut me open wide
And shoveled out my basement.
I never knew I had a sister,
But once my friend was gone, I missed her;
So, knitting till she raised a blister
My Mom made a replacement!