STEP 1: Hardcover fiction books (found at thrift stores)can run between 400 and 700 pages and they are ideal for this kind of project. This one had 751 pages.
STEP 2: Fold one page in half, toward the spine.
STEP 3: This is how the page looks when folded (once).
STEP 4: Create additional "thickness" between full pages by folding the page (shown above) in half again, toward the spine.
STEP 5: This is how the folded page looks when folded (twice).
STEP 6: I alternated these two folds (half page and quarter page) in between the full pages to spread the book into a 360 degree circle.