Jiva and Atman
The individual soul and its identity with the universal Self.
Jiva is the individual soul that appears separate due to association with body and mind. In essence, jiva is Atman - like space in a pot is one with infinite space.
Just as the space in a pot merges with infinite space when the pot breaks, so the jiva merges with Brahman when ignorance is destroyed.
This metaphor explains apparent individuality within unity.
Various Upanishads