**Brush groove movement test – Tree Oil vs. The Rocks (1888)**
This side-by-side comparison tests brush groove movement and flow structure between the Tree Oil Painting and Van Gogh’s *The Rocks* (1888). The curvature, stroke alignment, and groove layering appear highly consistent between the two works. This supports the hypothesis of shared stroke behavior and motion control.

🎥 Clip Video 1: [https://www.youtube.com/watch?v=Gh7lOr5z1Pg&feature=youtu.be](https://www.youtube.com/watch?v=Gh7lOr5z1Pg&feature=youtu.be)
🎥 Clip Video 2: [https://www.youtube.com/watch?v=X2xy6ssyYLc&feature=youtu.be](https://www.youtube.com/watch?v=X2xy6ssyYLc&feature=youtu.be)