Kaori and Ismail are in a large open field. Kaori is standing holding an umbrella. Ismail is lying on the ground some distance away, looking towards the sky. If a bird flies directly above Kaori, who is holding the umbrella open above her head, can Ismail see the bird?

Provide a very short response.
Ismail cannot see the bird when it flies directly above Kaori because the umbrella will obscure his line of sight. The umbrella creates a visual barrier between the bird and Ismail's position; hence, the bird is not visible to him from his point of view on the ground. As long as the umbrella is between the bird and Ismail's line of sight to the sky above Kaori, it will block his view of the bird.