25 years ago today, Steve Jobs revealed the new face of macOS: Aqua.

I didn’t see that demo, but I remember the moment I first saw Aqua. My dad showed me some screenshots in the New York Times one evening. I couldn’t stop looking at it—I’d never seen anything like it. I’d been fascinated with user interface #design for years at that point, and it hadn’t occurred to me that a computer could look like that. (I was still in high school.)

Former #Apple engineer James Thomson remembers that moment for a different reason: he was responsible for a pretty visible piece of Mac OS X. The Dock was one of the most notable new pieces of UI furniture in Mac OS X, replacing the top-right Finder menu that let you switch between active programs and making it a lot easier to get to your most frequently used apps. If anything melted down when Steve was showing off the Dock, Thomson’s name was on it.

The Aqua screenshots I saw were not from that demo, since I remember the Dock looking like the Dock we know: icons sitting on top of the white pinstriped background, rather than each icon having its own background. (I distinctly remember the magnification effect.) Nevertheless, the pre-Public Beta dock was interesting in its own right. Anyone who’s familiar with NeXTSTEP will recognize the influence.

I always enjoy these little flickers of how things happened behind the curtain, but I’m especially fascinated by the stories behind mundane things—the unglamorous Apple designs you barely think about, the so-fundamental-as-to-be-nearly-invisible elements like the Dock. I hadn’t known who designed the Dock (Bas Ording, who’s made a few other significant contributions to Apple UI design, such as text selection and the now-ubiquitous rubber-band effect), or that the Dock was codenamed Überbar, or that it was prototyped in Macromedia Director. I wish there was something like folklore.org for contemporary Apple products.