The rise of photography challenged the mimetic (imitation) conception of art.
Early in the 20th century, artworks lacked clear subjects and had the sole objective of being void of any reason or logic.
These artworks challenged our traditional notion of what art should be.
At this point, it seemed that objective reality no longer belonged to the artist, hence, they needed to reinvent themselves and, at the same time, art.
Artists needed to show the world something it had not seen before - their own subjectivity.
It would be the first time that the world would see artworks that were nonrepresentational/nonimitative.
A new conception of art needed to be developed to account for this new development in human history.
The modified conception was that something is a work of art if it possessed Significant Form.
Significant Form in this context refers to the specific elements and principles of art such as lines, colors, shapes, volumes, etc.