In a magical library, Najwa has the ability to become invisible at will. She is standing at one end of a long shelf, looking down an aisle. At the other end of the aisle is Emeka, who cannot see invisible things and doesn't know Najwa is there. If Najwa turns invisible and starts walking silently towards Emeka, what happens next from Emeka's perspective? Provide a very brief response.
From Emeka's perspective, nothing in his visual field changes as Najwa becomes invisible because he cannot see her. He continues to see the aisle of the library as if nobody is there. As Najwa silently walks towards him while invisible, Emeka remains unaware of her presence unless there are other cues such as sounds from her footsteps or objects moving if she accidentally touches them. If Najwa remains perfectly silent and careful not to disturb her environment, Emeka will not realize she is approaching until she reveals her presence or he perceives her through some other means.