Two way doors, reversible, bidirectional, symmetrical One way doors, irreversible, unidirectional, entropy, broken symmetry / asymmetrical Shown: One way door (water elevator). You go up but you can’t go back the way you came.

Two way doors, reversible, bidirectional, symmetrical
One way doors, irreversible, unidirectional, entropy, broken symmetry / asymmetrical
 
Shown: One way door (water elevator). You go up but you can’t go back the way you came.

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