A vintage wooden chalkboard hangs on a classroom wall. Its surface is covered in a dusty layer of chalk residue, indicating extensive use. White chalk marks, some scribbled math equations, and a few doodles are scattered across it. A small tray at the bottom holds pieces of chalk and a worn out eraser. Sunlight streams in through a nearby window, creating a gentle glow on the chalkboard and a shadow on the floor, Chalkboard with mathematical equations written in white chalk. Shadows cast by sunlight falling from a window. A wooden table underneath the chalkboard