To me he was a true genius - and extraordinary talent who took ideas, images, themes, sounds and language from the wilder shores of art, poetry, philosophy, dance, theatre - synthesized it with mass popular culture and then catalysed the result into smash hit pop music. He left everyone else running to catch up in his wake.
This is probably as close to a quintessential bowie song as you can get - and his last truly great moment IMO. A song built on a tense, twitchy funky loop about a smacked out astronaut dealing with an existential crises with a video featuring bowie as a pierrot, flanked by sinister mourners being menaced by a bulldozer. And he made it a no 1 pop hit.