In general spiders do not have good eye sight (jumping spiders and wolf spiders are some of the exceptions). That’s one of the reasons many hunt using webs – they use the vibrations to locate their food rather than their eyesight. If a spider is on your ceiling, the likelihood is that it can’t see you.
Even when they can, they don’t see the world the same way we do. Their eyes and brain are so vastly different from ours.
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