Mannen en vrouw bij een lessenaar en man op terras before 1904

Willem Wenckebach made this drawing, Mannen en vrouw bij een lessenaar en man op terras, with pen and ink and graphite. It is a double drawing, or maybe two sketches on the same page. Look at those figures! It must have taken Wenckebach only a few minutes to do these drawings, but he captured something of the relationship between the people. The group on the left appear as though they are engaged in some deep exchange, while the man on the right looks lonely. Maybe he is waiting? I can imagine Wenckebach sitting in the corner of a room, with a small sketchbook and pen, rapidly taking down these images as they passed him. It's the work of someone confident in their skill to capture the essence of a person with only a few marks. The drawings are quite sketchy, not overworked, with the quick marks suggesting a sense of liveliness, like a snapshot of a moment in time. These drawings remind me of some of those done by Degas in late 19th century Paris. Artists always learn from each other; they look, borrow, adapt, and reinvent. I wonder who Wenckebach looked at?