Simulacra

Algorithmic synthesis and precision material replication of autonomous, high-fidelity duplicates or digital clones that match the identity, behavioral profiles, and memories of an original entity until they independent-act or supplant them.

The thrill of confronting perfect copies of oneself or others, blurring the lines of identity and reality. It's the unsettling feeling of encountering an exact replica that might be more 'real' or have taken over the original's life.