**Brushstroke movement and width – Tree Oil Painting (for comparison with The Rocks, 1888)**
This image shows the measurement of stroke width in the Tree Oil Painting at the area corresponding to the cloud region analyzed in Van Gogh’s *The Rocks* (1888). The red circle marks the selected zone near the lower-left corner of the canvas. The measured stroke sizes range from 0.60 to 1.00 cm, with visible groove consistency, horizontal flow, and impasto layering — providing a suitable comparison for the brush movement test.

📐 *Data in this image matches the brush rhythm shown in The Rocks, 1888.*