Classroom environment is instructional before any teaching begins: how seats are arranged signals whether students should expect to work alone, in pairs, or discuss as a group, and where materials live determines how much time is lost to searching for them. Predictable routines -- how students enter the room, what they do in the first two minutes, how they ask for help, how they transition between activities -- remove dozens of small decision points each day, which is exactly what reduces off-task behavior, since most disruption happens in the gaps between activities, not during them. In under-resourced settings with large class sizes or no dedicated classroom, the same principle still applies: even a consistent opening routine (same signal, same first task) does far more for order than physical furniture ever could.