Passage Summary: To call a piece of art 'truly great,' it has to be both unique and have a big impact on other artists.

Reasoning: The principle establishes that for a work of art to be 'truly great,' it must possess both originality and far-reaching influence.

Analysis: This principle sets up two necessary conditions for greatness. In logic terms: Great -> (Original AND Influential). To apply this correctly, look for an argument that uses the absence of one of these traits to conclude that a work is not great. It is a common trap to try and prove a work *is* great using this; however, since these are only necessary conditions, having them doesn't guarantee greatness—it just keeps the work in the running. One might say the bar for 'greatness' is high, and failing to clear even one hurdle means you're just another piece of decor.