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 b

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. [1]: https://en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon https://en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon