1979
Sony Walkman
The Walkman is the clearest available demonstration that a design decision to remove capability can create a new category. Every specification a reviewer would have compared in 1979 was worse than that of a home system, and the one property that improved — portability — turned out to reorganize how millions of people listened to music. It also shows that a product is a system rather than an object: without the lightweight headphone, the player was pointless, and the headphone is the part most histories forget. Its commercial lineage runs directly to the portable CD player, the MP3 player, the iPod, and the smartphone, each of which inherited the same proposition of a personal, mobile, curated listening environment. For students, it is a compact case in identifying which single constraint, once broken, changes the problem entirely.