I'm someone who's rarely ever been cool (in my own eyes), so I've often pondered the elusive quality of "cool." Most of us would agree we couldn't define it exactly, but we know it when we see it. And I've always felt Bowie embodied it more than just about anyone on the planet. (Or should I say the galaxy?)
He also embodied creativity, which is one of the most important values in human life, certainly in my life. Being cool was really just a side product of how intensely, personally creative he was. And I think the reason Bowie came across as so cool and charming, even at his stylistically weirdest, was because he put creativity first. I get the impression he was always trying new stuff out merely because he wanted to, and he didn't particularly care if anyone else liked it or not.
He managed to be elegant as a duke and bad-ass as a rock star at the same time. He is one of the only people who could have ever made that Labyrinth costume look sexy. He is an LGBTQ hero. I was fascinated with his bicolored eyes and sculpted hair on my older sisters' vinyl record covers. His gorgeous voice and his songs are part of my childhood, and when I hear them on the radio I usually still linger on the station and turn up the volume. The "Changes" greatest hits album was one of the first CDs I ever bought, when I finally got my own CD player (and then later I bought more of his proper albums). He always seemed a bit like he was a fae creature or an alien--his crazy experimental fashions and his fascination with space travel may have reinforced that impression--and therefore it doesn't seem possible that he could have died. But he was a human after all, and can teach us all something about how to be creative mortals.
I'm pretty sure beings in other parts of the galaxy are listening to him right now. Earthlings will love and remember you always, Bowie!