What is theme?
the dramatic struggle or clash between two or more forces in a story
the recurring object, concept, or idea in a story.
the lesson a reader infers from reading a story.
the central message or insight revealed through a story.

In what way did van gogh put paint on his canvas when he painted wheatfield with crows? he put his paint on the canvas using very thin strokes of paint. he put his paint on the canvas using very well blended strokes of paint. he put his paint on the canvas as thick as toothpaste.