Why is the encounter, if authentic, need to be triadic?

Question

According to Martin Buber, “When two people relate to each other authentically and humanly, God is the electricity that surges between them.” For him, why is the encounter, if authentic, need to be triadic? 

Answer 1

God, in creating you as part of His Image, also created the world, and why?

Because the world is the communication of God about Himself. God has His Divine Thought expressed in the universe and you receive those things through your senses and being in the Image and Likeness of God , you are able to make some sense of them. You see the wisdom, the power, the transcendence.