FIG. 1 is a top, front perspective view of an illuminated cube embodying my new design;
FIG. 2 is a bottom, rear perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a rear elevational view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken-line disclosure on the bottom and the interior bubbles in random orientation represent portions of the article in which the claimed design is embodied, but which form no part of the claimed design.