The environmental protection dept of my state says that I should build my house beyond 75 ft from the river. (For a resource critical river the minimum clearance is 200 ft.) It also stipulates that I can maintain a "meandering path" at the river.
The code enforcement officer clarified that meandering means not moving in a straight path, but varying between left and right as one walks along the river. Opposite my house on the river is a little island, too small to have sufficient clearance from the river to build a house. The owner of the island could have a meandering path around that little island along the banks of the river.
Then imagine the school hall and a student meandering around the hall by the edges of the traversable areas of the hall.
Then imagine another student meandering about the hall randomly.