What common denominator unifies the artists who are considered Post-Impressionists?

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Post-Impressionists were artists who built upon the style of Impressionism in the late 19th century. They experimented with new forms and techniques, expanding upon the Impressionist focus on light and color. These artists were known for their bold use of color, brushwork, and form, and sought to express emotion and structure in their artwork. While many Post-Impressionists were French, not all were formally trained at an academy, and their work cannot be defined by their rejection of ancient Greek and Roman ideas or the use of impasto.

What Common Denominator Unifies the Artists Who Are Considered Post-Impressionists