board clean dry erase fresh green hand lines office start white whiteboard wipe writing do don't forget instruction memory not pen prompt red reminder text blue business completed done list marker meeting task tick to todo academic-institution backwall beams benches between-classes boys brown building children class classroom corrugated-iron corrugations covered decorated decorations design designed desks doors education furniture girls ground-floor interior light open open-space pillars posts property pupils roof roofing room school school-uniforms seating shelter steps students windows wood