Immortality (n.) is available to cells that refuse to become anything: tissue transplanted again and again stays undifferentiated and never ages, and the moment it specializes it dies.
Immortality (n.) comes in only one form a person can have: not everything dies, but what lives on is no longer the I, barely even the subject.
Immortality (n.) of the individual is a mental construction: metabolism never repeats itself, because neither the materials nor the conditions ever do.
Immortality (n.) could belong only to a being that could undo every change it undergoes, which means a being that never really learns anything.
Immortality (n.) belongs to the barely differentiated: creatures with a shallow nervous system never age, and they are also the ones whose edges, where one individual stops and another starts, are hardest to find.
Immortality (n.) cannot live in the inner self, which has too many animal roots, nor in the works, which only outlast; it can live only in the relation between the two.
Immortality (n.) inside becoming cannot be a motionless thing; for Plato it must be a stable ratio between movements.
Immortality (n.) is built into the created object: its maker feels he has made a possession for ever, or says he shall not wholly die, and the dream is half true, since a schema can be reused in later works even when the object itself is lost.