For me, this movie exemplifies everything that I like about all things Kubrick. IMO, he tends to make movies that are an inch away from being abstract beyond understanding, but yet keeps the flow of the film reeled in just enough to make it seem like it makes sense on some kind of creative level. And while I don't mind discussing what the underlying meaning(s) of ACO might be, I find that too much discussion on it tends to get in the way of the enjoyment that I get from noticing things like how colorfully crafted the art-direction is for a movie that doesn't bat a single lashed eye towards subjects like ultra-violence & the old in-&-out.
Visually, a beautifully crafted film with such a bite in it's theme that it acts as a well-balanced counterweight against the brightly set designs. Seldom do we see the contrast of light & darkness stitched on film in a manner that is instinctual, crazy & perfect all at the same time.