Eigengrau

From the related links in this article, I learned that Visual Snow[1] is not what everyone sees at nighttime or when they close their eyes, as I have, for as long as I can remember. I just figured our eyes cranked their ISO sensitivity up.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Visual_snow" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Visual_snow</a>

Another interesting phenomenon is seeing white blood cells swishing through the capillaries in front of the retina[1]. They are most noticeable looking at the blue sky on a sunny day.<p>[1]: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Blue_field_entoptic_phenomenon" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Blue_field_entoptic_phenomenon</a>

Fun fact: &quot;Eigen-&quot; is the same word part as in &quot;eigenvalue&quot;, &quot;eigenvector&quot; or &quot;eigenfrequency&quot;, meaning intrinsic&#x2F;inherent to.

<a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Noise_floor" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;Noise_floor</a>

It always reminded me of what you see when you take a high ISO photo in pitch darkness. Noisy and sometimes greyish depending on camera settings.

I don&#x27;t see gray but noise similar to TV static