### PHIZZ Models (Pentagon-Hexagon-Zig-Zag Models)

 Project taught by Dr. Eva Szillery at the Downtown Education Collaborative in Lewiston, ME.The project was originally designed by: Thomas HullFor more information: http://kahuna.merrimack.edu/~thull/phzig/phzig.htmlThe unit below can be used to create some very interesting three-dimensional models!It takes 30 of this unit to create a "30 PHIZZ Unit Dodecahedron" as shown below.It takes 105 of this unit to make a Torus which can be viewed at:http://sites.google.com/site/modularorigami3/torusTo make the unit itself, follow these directions:Step 1:  Fold the paper in half to create a mountain fold.Step 2:  Fold the top and bottom edges up to meet the middle fold.Step 3:  Position the paper as shown below.Step 4:  This is the top view.  Notice that the "bottom" of the M opens tothe left.Step 5:  Fold the top right corner down as shown below.Step 6:  Rotate the paper 90 degrees so that it appears as it does below.Step 7:  Fold the top edge down to create the shape shown below.Step 8:  Fold the "tail" up to create a straight edge at the bottom of thetriangular piece, as shown below.Step 9:  Fold the "tail" in such a way that it creates an isosceles trianglethat is similar to the one at left, but half the size.  You should also notice the right trapezoid that is formed in this step.Step 10:  Turn the shape over  as shown in the steps below.Step 11:  Now fold the square (seen at left in the previous picture) so thatit creates the final triangle.  The finished unit should look like two overlappingtriangles as shown below.Directions to assemble the "30 PHIZZ Unit Dodecahedron"Please note that three different colors will be shown below in orderto make the assembly steps easier to see.Step 1:  Be sure all 30 of your pieces are identical to the three shown below.Step 2:  Unfold, and align the units as shown below.Step 3:  choose two units to start with, and line them up as shown below.Step 4:  Notice how the blue piece tucks into the fold of the yellow piece.Step 5:  Line up the third piece, shown below in green.Step 6:  Tuck the green piece into the blue piece as shown below.Step 7:  Then tuck the yellow piece into the green piece.Continue attaching the pieces as you did to connect the first three. As you connect the pieces you should notice that the vertices are createdby each three pieces that are assembled.  You should also always have apentagon of "empty" space between the attached pieces.