Zephyr is standing on a hill looking down at three houses: one blue, one red, and one green. In each house, there is a person standing in front of the window. The houses are arranged in a straight line, with the blue house at the highest point of the hill, the green house a bit lower, and the red house at the lowest point. Assuming all the windows are transparent and at the same level, and Zephyr's eye level is higher than the top of the windows, what can Zephyr see through the windows? Provide a very short response.
Zephyr can see through all three windows because his eye level is above the tops of the windows, allowing him to look downward through the transparent glass. The downward angle from Zephyr's point of view on the hill and the linear arrangement of the houses facilitate a clear line of sight through each window. Therefore, Zephyr can see the person standing in front of the window in each of the blue, green, and red houses.