The campus was pathless until students formed their own paths, which were later formalized by bricks.

在学生们形成自己的道路之前，校园是没有道路的，后来这些道路被砖块正式化了。

The result is that you saw the light travel diagonally, as though its path formed two sides of a triangle.

结果是您看到光沿对角线传播，就好像它的路径形成了三角形的任一侧。