The North Building and the South Building are separated by a long corridor. The South Building is the College Entrance Examination Building. Senior high school students have evening classes at 10:30 and class ends at 6 o'clock. From spring to winter, one session after another, there was almost no contact between people on both sides.
The south building blocks the sun, while the north building is shady all year round.
That day, I stood in the North Tower and caught a glimpse of the light from the South Tower.
Conception:.