Next up—draw a transparent cylinder. Then, draw the trapezoid of the cylinder’s base. Cross diagonals to find its center. And draw a horizontal from the center out to the right, project lines to find the vanishing point and horizon. Using the vanishing point draw a wall to the cylinder’s right. Next, a central light ray from the cylinder’s lip. Now, a vertical up to intersect the light. Two more light rays from the widest parts of the top ellipse. Then the horizontals from the wide points of the base out to meet them. But, stop at the wall.