The Lexicon of paint.
Many assume that artists merely make pictures, but painting and most visual art is also a language. An artist builds up an entire lexicon of visual keys, a shorthand, to ideas of past efforts. Pollock's earlier work while not successful (insert your definition of success) gave him a basis for his later work.
His ideas found expression later but the building blocks for that breakthrough is
still there early on. An artist builds this language up over the course of their
career. Most good painters can see when another artist has been hesitant in
their strokes, inhibited in the execution of a work or ducking all possible
growth and personal challenge. We can tell immediately when a piece sings and
rages: Ideas and thought held manifest in the very paint. We build upon this
lexicon, a simple brushstroke conveys a myriad of ideas some dismissed and many
still forming but it speaks.

In Zen philosophy there is a saying that the old man is not the same as the man
of his youth, nor the child he was, yet they are still the same man. So too we
are new and old at the same time as painters. Pollock's earlier works may are
completely different than his drip paintings yet they are connected, related in
his own lexicon.
Were Cezanne's work merely images of Provence? Nostalgic and trite landscapes?
Odd still-lifes where the table is uneven? No, look at the paint the way it was
applied and the way he handled space and composition. See how form becomes
plastic and malleable in his work. Planes of color delineating form. These are not
the paintings of an unskilled country bumpkin at the fringes of the Paris scene,
they were the works of someone thinking and speaking visually. Dissect a Cezanne
and the Modern era becomes inevitable. The ideas were there in their infancy but
they were there for others to take further.
Art and painting has to be more than just formulaic A+B=Art. The end result
has to do more than look like art: it has to stand on its own and demand
respect. It does this through what is there in the paint. No amount of braying
will make it more than what it is.