More Tricks of the Mind
Here's another experiment to try:
Find a TV station that has the white-noise "snow" and stare at the center of the screen for at least 10 seconds. After that, tell yourself you want to see an "X" in the entire frame. The image may form and then drift and disappear. If successful at seeing that image, then intend on seeing a big circle and see if that image forms within the white noise. I've been successful at changing the image I see in my mind to basic shapes, even though it seems to be actually on the screen. I'm betting that if you film the white-noise as you do this, it won't change in the filmed image. This might be easier to do if you're fatigued, since the couple of times I've tried this was at the end of the night when I was ready for sleep!
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