For the source text click/tap here: Bava Batra 82
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The mishna teaches: With regard to one who buys two trees in the field of another, if the trees grew, the owner of the field may not cut down their branches. The mishna further teaches: That which grows out of the trunk belongs to the owner of the tree, but that which grows out of the roots belongs to the owner of the ground.
Rabbi Yoḥanan said: With regard to anything that sees the face of the sun, i.e., which is visible and aboveground, this is considered to be growing out of the trunk. And with regard to that which does not see the face of the sun but is concealed in the earth, this is considered to be growing out of the roots.
We explore the metaphor of the sun(light) in Plato and in Chabad Chassidus.