Here is another view of the multilink structure discussed in 3D Drawing.
Draw it in Oblique Projection - you may find using squared paper helpful.
Now try drawing it again, this time with a different face as the front.
Which properties of the original structure are preserved in your drawings, which are not? You should think about:
What do you think the advantages of Oblique Projection are? What disadvantages are there with this method of representing 3D objects in 2D?