Industrial design concerns the form and use of products made for repeated manufacture. A designer may shape the casing, controls, handling and production logic without inventing the underlying device. Harrison’s career makes this distinction especially useful: he did not invent stereoscopic viewing or the original View-Master, but he changed an existing viewer for another generation of users.
The Denver Art Museum’s account identifies his 1959 View-Master as a portable stereoscope. Two slightly different images, seen separately by the eyes, create an impression of depth. Circular reels made the experience compact and repeatable. That history connects the object to travel imagery as well as childhood play: looking at pictures of a destination and physically visiting it are different experiences mediated by different technologies.
For a close reading, separate three questions. What does the mechanism do? What did this designer change? How did that change affect handling or production? A familiar outline is not enough to attribute every similar object to Harrison. The useful cultural discovery is that anonymous-looking consumer goods have named designers, collaborative production histories and choices worth examining.