Conventionally, the two writers have been contrasted to one another with Shônagon as the witty conversationalist and Murasaki the reticent observer. I have built on this contrast in my characterizations as well. When Empress Teishi died, Shônagon went into her sister Genshi's service, but it is not known what became of her after Genshi died a year later. There is no record of her and Murasaki ever meeting face to face. My chapter entitled "Sei Shônagon" is an imagined "what if?" these two great writers had met and talked.
Japanese scholars have noticed imagery from The Pillow Book worked into The Tale of Genji. I have also pilfered from it. The largest chunk is the scene in my book describing how the emperor and empress (Teishi) were crazy about cats. The "Sei" in her name is the first character of her family name, Kiyowara, read in its Sino-Japanese pronunciation. No one is quite sure why she was called "Shônagon," literally "lesser counselor," a court title. It was common for ladies in court service to go by such nicknames, often based on positions held by their fathers or husbands—although this lady does not seem to have had such a connection. Ivan Morris, the esteemed translator of The Pillow Book, mentions research indicating that her given name may have been "Nagiko.