1. Do you know what these special solid shapes are called?

2. The Platonic Solids Every face is the same regular Polygon The same number of faces meet at every vertex

3. The Tetrahedron 60° Draw an equilateral triangle with one edge being the short side of your envelope

4. The Tetrahedron 60° Draw a line at right angles across the envelope and cut off the part of envelope which is not needed (unless you would like to make another tetrahedron from it!)

5. The Tetrahedron 60° Fold along the two red lines both one way then the other

6. The Tetrahedron 60° Push the two corners of the cut off end together

7. The Tetrahedron Image created by Robert Webb's Great Stella software http://www.software3d.com/Stella.php

8. The Icosahedron

9. Step 1

10. Step 2

11. Step 3

12. Step 4

13. Step 5

14. Step 6

16. These shapes make up an icosahedron – how?

17. Origami Cube

18. Icosahedron = Water Dodecahedron = Ether/Prana Tetrahedron = Fire Octahedron = Air Hexahedron = Earth

19. Carbon Virus FootballAmoeba Magic 8-ball

20. Challenge ! Can you make an octahedron or a dodecahedron out of paper? (Look on the internet for instructions) Can you work out why there are only 5 platonic solids (harder)

21. The Dodecahedron