The Cube
The cube is one of the Platonic solids. It is bounded by 6 square faces, and has 8 vertices and 12 edges. It may be thought of as the 3D analogue of a square.
The dual of the cube is the octahedron. The cube occurs as cells in the tesseract, as well as in various other 4D uniform polytopes. The full list is given below.
Projections
In order to be able to identify the cube in various projections of 4D objects, it is useful to know how it appears from various viewpoints. The following are some of the viewpoints that are commonly encountered:
Projection  Envelope  Description 

Hexagon  Vertexfirst parallel projection. 

Rectangle  Edgefirst parallel projection. Two of the cube's faces project to the top and bottom edges of the projection envelope. 

Square  Facefirst parallel projection. Four faces project to the edges of the projection envelope. 
Coordinates
The Cartesian coordinates of a cube centered on the origin with edge length 2 are:
 (±1, ±1, ±1)
Occurrences
The cube occurs in the following 4D polytopes:
 The regular tesseract, its direct 4D analogue;
 The runcinated tesseract, a member of the tesseractic family of uniform polychora;
 The runcitruncated 16cell;
 The rectified 24cell;
 The truncated 24cell;
 The 4,nduoprisms, such as the 3,4duoprism;
 The cubical pyramid.
 Cube atop icosahedron (K4.21).
 Cube atop cuboctahedron.