The corner of a room is the intersection of two adjacent walls.
Two walls or a wall and floor of a room intersecting.
i like eating pie!
A real-world example of an ellipse is the orbit of any object around another, when it is bound by gravitation - the Earth around the Sun, the Moon around the Earth, two stars in a double-star system...
As one of the railroad's best conductors, my grandfather was in charge of conduction.