questions about these curtains: does the material have a print or pattern to it? when it happens are the curtains completely still or blowing in a draft? where exactly are you seeing the faces? in a case of pareidolia it's your brain recognizing faces within existing shapes in the fabric pattern. Do you feel like that describes what you're experiencing or do you think you might be seeing things that truly are not there? pareidolia is different from hallucination. coincidentally curtains are how i discovered pareidolia!