It is imagination; it cannot be drawn. No matter how straight we draw a line, we can only draw it on the ground. Since the earth is round, the line drawn will also be round. We can draw a line in this room, but it’s part of the big circle of the earth. Diver and shark everything will kill you poster. Is it curved? It is such a small curve that we cannot see it. But if we keep extending it to one end, we will find that it is actually a circle around the world. We will see that the line has become circular; that’s why it is not possible to draw a line.