What is the importance of the film clip of Carol dancing with her mother in the novel, How to Be Both?

A film clip showing Carol dancing with her mother is digitized by Carol. The clip is 48 seconds long, and is copied and kept by George. It helps George to remember her mother, and to reflect on simpler, happier times. The film clip is one of the things that George keeps to remember her mother by. The clip also shows Carol near the beginning of her life, while in the present, Carol is dead.