Learn about properties of 3D shapes with this BBC Bitesize Maths article. For students between the ages of 11 and 14. ... The first image is a yellow tetrahedron. The second image is a blue cube.

The 3D images revealed that, at the nanoscale level, the crystals are a slightly curved finger-shape. These cluster together to form a hand-like pattern, and these themselves are pressed on top of ...