You can put this solution on YOUR website!
When I try to visualize something like
I don't think of it as a line. I see it (and also draw it)
as a triangle which is tilted just slightly away from the
vertical. I regard the zero as the limit of the adjacent
side over the opposite side. It may take practice to draw
skinny triangles, but I think the limit is a better thinking
tool than the straight line.