Megosztott hang

I think someone is in my room when I’m not home. Every day, I come back and my door is slightly open. The thing is—I always close it. So yesterday, I tested it. I shut the door completely and placed a small piece of paper between the frame so it would fall if anyone opened it. When I got back, the door was open. The paper was gone. So today, I recorded it. At first, nothing happened. Then, at 2:13 p.m., my door slowly opened by itself. No one was there. But something… moved. Like a s