The number three seems to have a particular significance, relevant in some strange ways to the relation between man and nature.
"mother-child-father, heaven-earth-hell, creation-preservation-destruction, birth-life-death."The Cube is an imitation of life itself --or even an improvement on life.
The problems of puzzles are very near the problems of life, our whole life is solving puzzles. If you are hungry, you have to find something to eat. But everyday problems are very mixed--they're not clear. The Cube's problem depends just on you. You can solve it independently. But to find happiness in life, you're not independent. That's the only big difference.