Free Body Diagrams on Chalkboard in Lecture Hall

Soft, diffused daylight falls through the high windows of a Barangaroo lecture hall, illuminating a large blackboard covered in white chalk vectors and force arrows. Dust motes hang suspended in the air, catching the gray light from the low-hanging clouds outside. The chalk lines vary in thickness, showing where pressure was applied during late-night preparation. A small pile of eraser shavings rests on the bottom ledge, against the smooth, dark surface of the board. Faint smudges of chalk dust mark the edges of the frame where a hand recently wiped away a previous equation. The shallow depth of field blurs the empty wooden seats in the background, keeping the focus sharp on the geometric precision of the physics diagrams drawn in the turn of the seasons.