The design process always combines the pursuit of functional goals with countless intuitive, even irrational decisions. The functional requirements — the house needs a bathroom, the headlines have to be legible, the toothbrush has to fit in your mouth — are concrete and often measurable. The intuitive decisions, on the other hand, are more or less beyond honest explanation. These might be: I just like to set my headlines in Bodoni, or I just like to make my products blobby, or I just like to cover my buildings in gridded white porcelain panels. In discussing design work with their clients, designers are direct about the functional parts of their solutions and obfuscate like mad about the intuitive parts, having learned early on that telling the simple truth — “I don’t know, I just like it that way” — simply won’t do.