why was marsden hartley considered one of the forerunners of the modern art movement?

why was marsden hartley considered one of the forerunners of the modern art movement?
Answer
Brief Explanations:
Marsden Hartley experimented with abstract - like forms and incorporated personal and cultural symbols in his work, breaking away from traditional art styles and paving the way for modern art concepts.
Answer:
He experimented with new forms and symbols, departing from traditional art.