We have been making 3D models using 2D shapes. We made a cut half way through the middle of two rectangles to join them together to make the base.  Each individual shape was then added by simply making a small cut in the middle of one of the sides of the 2D shape and half way through the shape. The shape was then simply placed on to the existing base by sliding the cut shape over any part of the model to create a design.  Here are some examples of our work.  Why not try making one at home?Â