In a world where people can become invisible at will, Keiji, who has the ability to turn invisible, stands in an empty field. In the center of the field, there is a tall tower with a single window at the top where Amara is looking out. If Keiji turns invisible and walks straight towards the tower where Amara is looking from, will she be able to see him approaching?

Provide a very brief response.
Amara is at the top of the tower looking out of the window. If Keiji turns invisible, he cannot be seen by the naked eye. Since Amara is relying on her eyesight to detect any approach, and there is no explicit note of any secondary detection methods like sound, infrared vision, or magical ability to see invisible things, she will not be able to see Keiji as he is invisible. The only way she would know Keiji is coming is if his movement stirs the grass or if he makes noise, but based on the current information given, where only eyesight is considered, Amara will not be able to see Keiji approaching the tower.