If you've never seen the optical illusion, it is stunning.
You stare at the center (unmoving) dot in a moving field. The field remains; the dot fades away - and POPS back the second your eyes move.
Your unconscious, constant "jiggling" of your eyes is called saccadal movement. Without it, only moving things would be visible - which is true for frogs.
That reminds me of the one 'trick' I was able to play on myself with a windshield mounted GPS. Placing it just so in the overlapping vision that it effectively becomes transparent from the brain's compositing of the two images.
You stare at the center (unmoving) dot in a moving field. The field remains; the dot fades away - and POPS back the second your eyes move.
Your unconscious, constant "jiggling" of your eyes is called saccadal movement. Without it, only moving things would be visible - which is true for frogs.