Read it from left to right, like a book. Yellow is singles, red is albums and orange is music videos.
Bowie had a prolific career from 1964 to 2016. In the late 60s he focused on singles and a handful of albums. Through the 70s and 80s, his output increased as he started to include music videos. There’s a gap where he had a heart attack in 2004 so he slows down until right around the time where he realises he’s dying, he puts out a slew of singles, videos and an album.