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Jonah wants to stay next to the work . The same reach , tray after tray of light glass vials , has worn his shoulder out , and he wants that reach taken from him . He also wants to remain in the spot . The next tray is sometimes cracked , and a person still has to see that . Across the aisle a welding robot lives inside a cage . It joins metal , and nobody walks into its reach . Car plants were among the first to put robots like that on a line , and the shape is still common : a hard repeated job , and a fence . Jonah can watch the weld through a screen . He cannot put a hand in . The arm beside him is a different kind of machine . People call it a cobot , built to share space with a person . It is smaller than the welder . He taught it the path by moving the arm with his own hands , and then it repeated the path . If it meets someone it did not expect , it is meant to stop . That is not a promise that harm is impossible . It is why this arm has no cage . A camera helps the cobot find the tray when the belt sits a little off . It does not notice a cracked vial . Jonah still does . The robot in the cage does not need his eyes on every weld . His line does . A cap rolls under the belt . He reaches without thinking , and his sleeve brushes the moving arm . The arm stops . The trays wait . Behind the fence the welder keeps its bright point and does not pause , because no one is in there to touch it . Jonah picks up the cap , steps clear , and starts his arm again . He gets part of what he wanted . The plain reach is no longer his shoulder's job . The cracked glass still is , and so is the decision to step back in . The welder was never going to share a floor with him . The arm that stopped is the one that can .
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