Eyes on my Window

6 months ago, these eyes made from dust appeared on my window, I'm s very skeptical person about any of this stuff, and this is the first time I post on any kind of forum about this topic, I always try to get the most logical explanation, but these creeped the hell out of me. They're perfect eyes, with iris and pupils, and they are really goddamn scary. I cleaned the window after I saw them. There were total of 9 eyes, but but not all of them were clearly visible. Could them be a formation caused by humidity? I don't know for real, but they're creepy asf. Don't believe me, but they started to appear on my dreams, as a negative entity.