With pencil, very lightly drawn:
1. Draw two parallel lines
2. Draw next 2 parallel lines as if you are starting two triangles realy close togethter, slightly overlapping.
3. Enlarge the two lines in the middle, you now have 3 shapes of unfished triangles.
4. Finish the triangle shapes
Now take your micron (or other ink pen)
5. Aura inside the shapes
6. Aura around the shape, and make the triangle points rather round
7. Draw the completed shape, by connecting the lines in the center part. Think of celtic knot drawing with the over under principle
8. Finish the corners by making the ribbon look
Ta DA finished is your moebius logo shape/string....