 The grand 600-cell can be seen as the four-dimensional analogue of the great icosahedron (which in turn is analogous to the pentagram); both of these are the only regular "n"-dimensional star polytopes which are derived by performing stellational operations on the pentagonal polytope which has simplectic faces.It can be constructed analogously to the pentagram, its two-dimensional analogue, via the extension of said ("n-1")-D simplex faces of the core "n"D polytope (tetrahedra for the grand 600-cell, equilateral triangles for the great icosahedron, and line segments for the pentagram) until the figure regains regular faces.The Grand 600-cell is also dual to the great grand stellated 120-cell, mirroring the great icosahedron's duality with the great stellated dodecahedron (which in turn is also analogous to the pentagram); all of these are the final stellations of the "n"-dimensional "dodecahedral-type" pentagonal polytope.