Three boys–plus some extra dimensions…
Many Dimensions
The tesseract, also called an 8-cell or regular octachoron, is the four-dimensional analog of the cube, which is in turn the three dimensional analog of the square. The tesseract is to the cube as the cube is to the square; or, more formally, the tesseract can be described as a regular convex 4-polytope whose boundary consists of eight cubical cells. A generalization of the cube to dimensions greater than three is called a hypercube…
You’ve read a Wrinkle in Time right?