If you look carefully enough through fabrics in the direction of a light source, you can literally see optical distortions that are likely excited states of gases and water vapor black holes, amirite?

I don't know if it actually happens with fabrics because I never tried, but refraction in the situation you're describing has nothing to do with gases or "water vapor black holes (?)", and also I think it's weird that you can see it with a random light source because even if it's technically possible to see it with white light, if you're not in a very dark room and using a powerful enough source of light it becomes nearly impossible to see it, this kind of experiments are usually done in dark rooms using lasers

What's a water vapor black hole? I did (admittedly only a few minutes) research trying to find what this is but Google is stumped... Keeps showing me articles about water vapor clouds around black holes in space.

Also, what about the fabrics causes gas to become excited?

Finally, what's the million slit experiment? I'm familiar with the double slit, but i can find no references to a million slit experiment.