From Wikipedia
The Fruit of Life (a component of the Flower of Life) has thirteen circles. If each circle's center is considered a "node", and each node is connected to each other node with a single line, a total of seventy-eight lines are created. Within this cube, many other shapes can be found, including two-dimensionally flattened versions of the five Platonic solids. The true Metatron's Cube will include all five Platonic solids in such a way that the solids, existing in volumetric 3D space, have had their z-coordinates set to zero but their x- and y-coordinates retained, such that they are orthogonally flattened.
In early kabbalist scriptures, Metatron supposedly forms the cube from his soul. This cube can later be seen in Christian art, where it appears on his chest or floating behind him. Metatron's cube is also considered a holy glyph, and was often drawn around an object or person to ward off demons and satanic powers. This idea is also present in alchemy, in which the cube was favoured as a containment circle or creation circle.
