Book du jour - perhaps a cover

Doing a rubbing of stitched fabric is like taking an x-ray:

 And if you turn the fabric over, the "picture" reverses itself:

Suddenly you have the back and front covers for a book.

"What if" - you used thicker fabric, or thinner fabric, or stitched in paper (thick and thin), or left the stitching very loose, or reintroduced some colour, or used the fabric itself as a page of the book (maybe with a false back so the stitching was hidden) ... enough already! All I wanted was to have something mindless to stitch while catching up with a few radio programmes...