Draw a bull.
Make it as realistic as possible.
Easy enough?
Now draw a bull using only block shapes.
Let’s take it further.
Abstract away all extraneous detail: draw a bull with only a few lines.
Of course, Picasso was able to draw a realistic bull. He drew all of the above.
His magic though was in paring back—abstracting so that even a few lines can tell the same story.
Most folks are content with replicating the bull. Few explore the limit and produce something entirely new.