Four lessons that show the enduring value of David Ogilvy’s advertising wisdom. Why the industry should re-embrace the legend’s insights to guide it through an uncertain future. Strolling around the south of France a few weeks ago—populated with execs from the best, brightest, and richest brands, ad agencies, media companies, and social and tech platforms gathered here for the Cannes Lions Festival of Creativity—you could almost hear the constant chant of “AI, AI, AI, AI .