This piece represents the body and the soul. They mirror one another but cannot see each other.
Black symbolizes the body, white represents the soul.
This also expresses the biblical concept of “Panim El Panim” which has been used throughout the Torah to speak of the concept of meeting with God face to face. This phrase appears 3 times in the Torah – connecting God with Avraham, Moshe, and Yechezkel.