Marie-Laure Ryan explained to me, the reason behind the making of Symbol Rock as a hypertext instead of a TV documentary:

"I do not have the financial support to do a TV documentary. I am not trained as a filmmaker. All I have is a text to edit and some visual documents. I want to present this story the best I can. The hypertext format to me is a compromise between the timelessness of books and the forward movement of movies/TV. So, the question to ask is not: what is the ultimate best way to present this story, but: what is the best way within the economic situation that the author is confronted with."
Mari-Laure Ryan