rands are emotions made physical. The clothes we wear, the media we consume, the devices we use — all signal not only to others what we value and see in ourselves, they also are a way to construct our very identities. Experimenting to deepen that bond has been at the core of the marketing profession for a century; its origins rooted in Freudian psychoanalysis. There had always been one critical limitation, though: Marketers had to appeal to the masses. Radio, television and print media allowed brands to deliver only one message to everyone, no matter if their product conferred luxury or smart cost-consciousness. On the internet, the masses have been shattered into ever smaller shards, shifting that marketing calculus toward targeted audiences and social network interest groups. Today, niche brands, large corporations and every business in between are reaching ever-narrower audiences.