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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?
Can you mentally fit the 7 SOMA pieces together to make a cube? Can you do it in more than one way?
Can you use small coloured cubes to make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of each colour?
Is it possible to remove ten unit cubes from a 3 by 3 by 3 cube so that the surface area of the remaining solid is the same as the surface area of the original?