Planning a book
My friend Sophie is a very good writer, and after I saw a beautiful post from her with some very evocative imagery, I challenged her to plan and write a book. She then challenged me to write a guest post on her blog about planning a book. I then counter-challenged her to contribute to my 300 stories series.
So, with multiple challenges flying around cyberspace, I will go and plan (and then write) my 'how to plan (and then write) your book' post. And if she sends me a 300 stories entry, I'll reciprocate with my guest post!