Today, of course, we're used to screens being completely flat, almost paper-thin, with perfectly square edges, and consistent, reliable colors from the second you switch them on. It wasn't always so.
Even up to the year 2000, most desktop computers were attached to a hulking great VDU (Visual Display Unit), a huge box of a thing that was usually deeper than it was wide, and that housed a heavy glass assembly called a Cathode Ray Tube.
These CRT displays were not just big and heavy, annexing proportions of your desk that would seem ludicrous now, but they drew an enormous amount of power; I remember reading detailed analyses of how a flat-panel display would pay for itself in a given number of years since it used so much less electricity.
What they weren't, though, was bad. It's easy to look at those ancient behemoths and assume they had terrible colors, that their convex, bulbous glass front distorted everything unpleasantly, and that because you don't get a perfect grid of pixels to light up, details were soft and fuzzy. Actually, when stand-alone flat-panel screens were introduced, it was common to dismiss them; compared to even a mid-priced CRT, they were small, expensive, and didn't display colors anywhere near well enough. For many years, image professionals wouldn't touch a flat-panel. Plus, they started life with analog connections, so that even though, yes, your Mac could be outputting a perfect grid of 1024×768 pixels to a display that had a 1024×768 panel, you had to fiddle with the settings to get the pixels to line up properly.
What's more, while most consumer CRTs over the technology's lifetime were indeed a little fishbowl'd, as flat-panels started taking over, CRTs with completely flat screens were becoming common.
You could also, for a while, buy screens that were flat on one axis; I know for sure because the first Apple monitor I bought was the AppleVision 1710 which had a Sony Trinitron tube. It was flat vertically but bowed laterally. This is also how I — and my poor dad — know for sure how heavy these CRTs were; this was the display I had connected up to my Macs while I was going to college, and it was dutifully lugged up and down flights of stairs to student accommodations at the start and end of each academic year.
Still, it was inevitable that flat-panels would take over, and in 1998 Apple introduced its first flat-screen monitor, the Apple Studio Display. Introduced at a time when Apple's Macs were still all beige, this magnificent vision of translucent blue and blue-grey plastic looked desperately modern and exciting. It would be rereleased in white and turquoise to match the Power Mac G3 which was introduced in 1999, and while that model comes up reasonably often on eBay, these original flat-panel Apple displays are a bit rarer.
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