The limitations that the Post-Impressionists saw were basically founded in the Impressionists concern and devotion to naturalism and the momentary effects of lighting. Post-Impressionists, while also preoccupied with the uses of color, were seeking both a more expressive use of color and like Georges Seurat, a somewhat scientific analysis of color.
While the aims and ideals of the Post-Impressionists were clear, the styles of the various painters in the movement varied wildly. Van Gogh's "Starry Night" is a long leap from Seurat's "Sunday Afternoon on Grand Jatte". The Post-Impressionists, while held together by their innovative and free uses of color, created a much diverse output than the more idealistic Impressionists.