My husband, Dan, walks into the family room and sees me, arms outstretched, tilting to one side like an airplane banking a turn. “What are you doing?” “Fixing the wall,” I say, leaning deeper left.

Five innovations that transformed our visual language. For the my new book, 100 Ideas That Changed Graphic Design, co-authored with Veronique Vienne (Laurence King Publisher), we each chose 50 that we ...