In terms of which art? Visual? Music? If you are asking in general then the most common meaning of “strands” are ways to identify skills and principles. That’s what we mean when the term is brought up
The first note is a half note so it’s 1, 2 and the quarter note is 3. Then the next measure is quarter notes so 1,2,3. Then I think the last measure goes 1 2 and 3
