For Cat Seto, Paris has proven to be somewhat of a lucky charm. The San Francisco illustrator, author, shop owner and founder/creative director of the stationery collection and shop Ferme à Papier took her first trip to the City of Light a little over four years ago. That trip and subsequent ones resulted in a dramatic shift in both her aesthetic and her business. Her new book, “Impressions of Paris: An Artist’s Sketchbook,” (Harper Design, 176 pages) came about after her agent encouraged her to think up her dream project. The result is a visual tour of Paris through its food, light and architecture illustrated by Seto and divided by color, pattern, perspective and rhythm. She spoke to The Chronicle after a recent launch event at Books Inc. on Chestnut Street. Read more.