Figure: Close-up view of *The Tree Oil Painting* brushstroke, aligned with the torque zone from Van Gogh’s *Old Man Portrait (1885)*.

This stroke was manually identified and captured by Haruthai Mongbunsri in 2015 using direct visual comparison.
The photo shows a magnified segment of the Tree Oil canvas exhibiting a high-torque wrist movement — visibly matching the cheekbone region (foreground arc) from the portrait’s red-circled stroke.

Scotch tape was used to lock alignment during observation, preserving the stroke rhythm.
This matching arc reveals not just visual similarity, but motoric synchronicity — a unique indicator of the same hand.