I doubt anyone can really help me with this, I was just musing. I, like most people, occasionally notice "floaties", small, out of focus hair-like objects, when looking at a white background and focusing correctly. These are I believe the shadows of bits of dead matter within the vitreous humor, floating down inside the eye (I can observe them slowly moving downwards when I keep my eyes still). They are clearly inside the eye because when I move my eyes, the floaties remain in the same place in my visual field. But I noticed, when looking at these floaties, that when I move my eyes to look slightly upwards, the floaties appear to take a little extra longer to move up to their new position. I was wondering if anyone had any ideas why - I can only imagine it's either a physical reason, i.e. the inertia of the fluid in the eyes means the floaties move slower than my vision, or else a perceptual reason i.e. the unusual way the floaties move with vision causes an illusion as a result of us noticing them moving upwards, expecting them to continue as it's a rapid motion, and then the floaties appearing to move downwards when they stop because they appear to "decelerate".