1) With the paper horizontal, close your eyes, and starting anywhere, drag the marker across the page with any motion you desire. However, do not allow the line you are making to intersect itself. You can move the marker around as much as you wish, making as many variations in the line as you want.
2) Open your eyes, and place the marker on a different part of the page. Then close them and repeat the instructions of the first step, forming a second line that does not intersect the first.
3) Open your eyes and connect the start and end points of both of your lines in any way you see fit, forming a closed shape.
4) On the inside of your new shape, concentrically trace any closed areas until you cannot fit anymore shapes inside the original one.