Answer:
trick of the light!!! but maybe i will take the plunge ..
“A rhetorical question posed repetitively throughout the song, Bowie addresses the passage of time, suggesting its fleeting quality. The lack of an answer gives the song a melancholy tone as Bowie mourns his own life.
Coincidentally Bowie died on the Sunday after the record was released, so he was not here to physically experience Monday. Instead it became a day of mourning for many of his fans.
One can also cross-reference this with Morrissey’s “Every Day Is Like Sunday,” with its steady insistence that:
Every day is like Sunday
Every day is silent and grey
Both make use of the final day of the week’s Apocalyptic power; the image of a never-ending Sunday representing the end of youthful enjoyment, and ultimately, death.”