What does it mean when a writer narrative structure is a spiral and what does it mean when a writers narrative structure is webbed?

Answer 1

spiral structure:

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=spiral+literary+structure&btnG=Search

webbed structure:

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=webbed+literary+structure&btnG=Search