On Sundays, the school building was quiet, the huge public classrooms were like a silent wilderness, and the names of "Peter Paul Rubens", "Edvard Munch" and other masters were written on the blackboards, and it seemed that the last class here would be Western art history. The beech wood texture of the desks and chairs, the wide podium, and the double-group lifting blackboard are not familiar to me when I just walked out of the school, although they are not very friendly. A ladybug crawls aimlessly on the windowsill. The morning sun shines directly through the window, casting a square light and shadow on the podium, and there are many fine dust particles floating in the light, and if you look closely, it seems that each particle is reflecting the sunlight, forming a lot of light points, and they are constantly fluctuating and dancing, as if it only takes a blink of an eye, and what you see is not the particles you just saw. When there are no drafts, their drifting becomes more active. I looked at the dust in front of me and wondered where the particles in the dust came from and where they would eventually go. Where am I in the midst of these visible and invisible dust, or in the midst of these ubiquitous dust particles? It seems that I am at a point of active three-dimensional spatial coordinates, and I am always enclosed in this space, did I choose this point, or did time push me to this point? I thought about it repeatedly, but the answer always seemed to be not far away from me, no matter how I chased it, I kept the same distance, no matter how I couldn't get it, it felt like my hand had touched the drifting dust particles, but there was no touch, as if I hadn't caught anything, in fact, I didn't catch anything, I looked at the dust in front of me, and the path of thinking began to gradually extend out the window, into the boundless space. The answer I want is like a fog that can't be dissipated, covering every corner of the world that can be hidden. Maybe people are like this dust particle, each with its own world and story. At this time, there was a small chortag of footsteps in the corridor, which should be the end of the class meeting of Melly's class. My mind came out of the fog for a moment, and I looked back at the door of the classroom, and sure enough, it was the students in that class. Suddenly, Melly's figure came into view, and she turned left after entering the door, and walked down the aisle by the wall towards me! When we met each other, we looked at each other and smiled, I smiled respectfully, and her smile also contained an apologetic component, I stood up, she walked a few quick steps to me, Melly was wearing a white cotton half-sleeved T-shirt printed with a Snoopy pattern, gray and black apple jeans, and canvas casual shoes with a crimson white sole.

"I'm so sorry to keep you waiting so long!" Melly said with her head bowed, her supple hair glistening in the light of the window.

"It's okay!" I replied, "It's Sunday time, even waiting for me is a break and relaxing!" ”

Listening to my words, Melly's slightly restrained expression began to relax, "The counselor held a meeting to talk about the exam, and it was a temporary notice!" As she spoke, Melly rubbed the corner of her eye with the little finger of her left hand.

"Sleepy?"

"A little! I was going to get up at 10 o'clock and call you, but the counselor called the dorm at 8 o'clock to announce the meeting! Let's not talk about that, let's go to dinner, shall we? ”

"To the cafeteria?"

"Hmm!"