Well, where do you start with such a thing?
The Orchestral Manoeuvres in the Dark album, by the group of the same name, was one of the most important releases in the history of all recorded music, bar none, and no hyperbole necessary. To this day, electronica is one of the most popular forms of music but it has lived almost entirely under the radar because our culture hasn't figured out how to exploit electronica for massive financial gain. You could write books about the impact of electronic music and how it has utterly inserted itself into the consciousness of the world without so much as a blink and a nod from the media; suffice it to say, this is the album where you can start Chapter One.
Of course, there were others. I'm not saying that this is where everything started (Kraftwerk, anyone?) But this is where you could start without angering too many people.
The design impact alone is worth volumes. To use two very modern, bright colors and then contrast them like this is genius. The cover is very distinguishable. The image created here is very much in line with the music inside and the efforts that went into making it. Slapping two smirking mugs on the front of this thing would simply not do. The cover had to be modern, and this is the cover they chose. It's absolutely timeless without being dated and it's very much rooted in the beginning of electronic music without being cheap or disposable.
This is the expanded, remastered version. It works on so many levels. There are exactly 100 of those orange things on the front of the album, by the way. A perfect square printed on the front of a perfect square. It doesn't get any smarter than that.