Crazy tic tac bounce!? | EVERYDAY MYSTERIES

that was great! I'm having a question here because you said we can write here the physical facts that we see so here it is.
keep your finger almost 2 inches far from your eye and close the other one. and look at the vertical lines like a door and focus your eye the way u see both ur tip of finger and the door blurry, i mean focus somewhere between them. you will see the moment you move your finger near that vertical line that line bends! what's this illusion? how can this be physically explained?