Constriction creates a world of concealment.
So our world is a reality that is not nullified vis-a-vis the divine light of Ein Sof.
For such a reality to exist, there must be a vast distance between us and God, and a dense concealment of His presence; for if we were to be directly aware of the divine presence in everything, then there would be no more world.
The reality of this world is a play of light and shadow, of revelation and concealment of the divine light.
The moment that the light of Ein Sof is revealed, the game is over.
Then there is only the one light.
—Rabbi Adin Steinsaltz