What is the relationship like between design and AI within your organisation? Are they parents that don't talk, separated by complex data algorithms and machine learning jargon? Are they distant relatives, reuniting briefly at the bottom of the service blueprint every so often? Or is there no relationship at all? Are they simply two ships passing late in the night? This article explores not only how AI can help us design better services, but also how design can help build better AI. The relationship is symbiotic.