Light and Shadows by Fyodor Sologub — Read

Volodya was sitting in his class. He felt depressed. He listened inattentively.

He raised his eyes. A shadow was moving along the ceiling near the front wall. Volodya observed that it came in through the first window. To begin with it fell from the window toward the centre of the classroom, but later it started forward rather quickly away from Volodya -- evidently someone was walking in the street, just by the window. While this shadow was still moving another shadow came through the second window, falling, as did the first one, toward the back wall, but later it began to turn quickly toward the front wall. The same thing happened at the third and the fourth windows; the shadows fell in the classroom on the ceiling, and in the degree that the passerby moved forward they retreated backward.