You can see three sides of each of two dice, and notice that the total number of pips showing is a perfect cube.
What are the numbers of pips on each face that you see?
The absolute minimum which the faces of the dice total is 12 (1+2+3+1+2+3). The absolute maximum is 30 (4+5+6+4+5+6). The only perfect cube in this range is 27. The pips seen can be are 6,5, and 4 on one die and 6,4, and 2 on the other.