One of the under-recognized masterpieces of psychedelic music, IMHO.  

Speaking about Louis Armstrong (but it certainly applies to this Miles Davis composition as well),  in 1952, Ralph Ellison wrote:

Once when I asked for a cigarette, some jokers gave me a reefer, which I lighted when I got home and sat listening to my phonograph. It was a strange evening. Invisibility, let me explain, gives one a slightly different sense of time, you're never quite on the beat. Sometimes you're ahead and sometimes behind. Instead of the swift and imperceptible flowing of time, you are aware of its nodes, those points where time stands still or from which it leaps ahead. And you slip into the breaks and look around.  That's what you hear vaguely in Louis' music . . . So under the spell of the reefer I discovered a new analytical way of listening to music. The unheard sounds came through, and each melodic line existed of itself, stood out clearly from all the rest, said its piece, and waited patiently for the other voices to speak. That night I found myself hearing not only in time, but in space as well. I not only entered the music but descended, like Dante, into its depths . . . It was exhausting -- as though I had held my breath continuously for an hour under the terrifying serenity that comes from days of intense hunger. And yet, it was a strangely satisfying experience for an invisible man to hear the silence of sound. I had discovered unrecognized compulsions of my being -- even though I could not answer "yes" to their promptings. I haven't smoked a reefer since, however; not because they're illegal, but because to see around corners is enough (that is not unusual when you are invisible). But to hear around them is too much; it inhibits action. (from Invisible Man, Ralph Ellison, 1952)