Whether it’s cassette Walkmans or MP3 players, audio and video tapes, CDs, Blu-ray discs, or even digital cameras as discussed in the “Rise and Fall” section—all these devices have either been rendered obsolete or faded into niche use by professionals. The reason is obvious: the ubiquitous smartphone in everyone’s pocket. As the final chapter of this section, it is fitting to turn our attention to this little device—the ultimate successor to all the technologies previously discussed.