It turns into a different story. What is it?

“A book”

While a book can tell different stories, it doesn't literally turn into a different story like a spiral staircase does as it ascends or descends.

“A movie”

A movie can have plot twists and different narratives, but it doesn't physically change or turn into something else like a spiral staircase does.

“A roller coaster”

A roller coaster provides a thrilling experience and may change direction, but it doesn't represent a different story in a literal sense like a spiral staircase does.