Looking for a Visual Guide to Rails

I was listening to an older episode of the Ruby on Rails podcast
hosted by Geoffrey Grosenbach and heard an interview with Amy Hoy. She
was talking about an upcoming book she was writing for PragProg that
would show rails from a visual learner’s point of view. I became very
interested in this subject since a picture is worth so many words and
faster to process. After looking I have not found any trace of the
book that was mentioned in the interview. Has anyone heard about this
book or know of a resource that would provide this view of rails?
Mostly, trying to get the picture on how rails interconnect and
understand the magic better.

Thanks

Adam
QED