Everything your eye sees is upside down AND backwards. For example, the upper nasal quadrant of the retina corresponds to the lower temporal quadrant of your visual field. I've heard some doctors say that floaters can eventually "sink" out of sight with gravity, but I pretty much think that's just something they say to settle people down so they can move on to the next patient. But yes, if a floater sunk to the bottom of your eyeball with gravity, you would perceive that it was rising up into the extreme upper part of your visual field. My floaters sure haven't "sunk" out of my sight line. They originated in the extreme upper periphery of my vision (corresponding with the bottom of my eyeballs) and eventually developed the ability to swing into my central vision. When I hold still, most of them look like they are settling to the bottom of my vision. So if anything, the physical junk in my eyes tries to float UP.