Antonia Pesenti and Hilary Bell have been friends since they met in Paris in 1995. Antonia is an architect and illustrator, and Hilary is a playwright and lyricist. Their friendship turned into a collaboration when they created the bestselling Alphabetical Sydney. The book has inspired a museum exhibition, a musical and many Book Week costumes. Hilary and Antonia continue to make books together that explore themes of place and belonging, with Numerical Street and, most recently, Summer Time.