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There he crouched with heavy-lidded, unseeing eyes, not asleep, not awake, not dead, not alive, still as a stone, gyrating with the world.

Daniel, with his unseeing yet piercing gaze, turns out to be the conscience of this story, which doesn’t mean that he, his memories or his eventual testimony can be entirely trusted.

Hamm, the volatile, unseeing tyrant in Samuel Beckett’s “Endgame,” has ordered the creation of this cloth companion: one more creature to shrink from him in the dreary, age-worn room that is his realm.

In other words, spiders toss, turn, and avert their unseeing gaze, much as humans do during their dreams.

In most industrial environments, robots are essentially unseeing operators.