Due to the device’s unique acoustic structure, simply installing the ACP-2 acoustic conditioning panel enables it to condition the reverberations from instruments or audio sources, and create an environment in which sound can be enjoyed. Since the sound absorption of this acoustic technology extends to bass notes (as well as the treble notes covered by standard systems) and produces a sufficient sound dispersion effect, it yields better acoustics than ever before. The TCH acoustic conditioning panel (the forerunner of the ACP-2) was 90 cm tall. However, this model was chiefly aimed at instrumentalists, while the ACP-2 is designed for use by audio enthusiasts and players of upright pianos as well. The new device has thus been designed as a freestanding panel 120 cm tall. I joined this project right at the outset, when the technology for this advanced-design product had only just been developed. As the designer, I was engaged in actually incorporating the technology into the product, while at the same time searching for use cases that required this technology—from a viewpoint diametrically opposite to that of the engineers. This process was akin to identifying the who, where, and why of this brand-new technology, and then weaving stories around these elements. The development of this device (unlike that of ordinary products) saw an overlap between the domains of the designer and the engineers, with the roles being reversed on occasion. To my mind, this allowed us to experience the real joy of design in a broader sense.