Spiders were changed in JtRH to differentiate them from roaches and make them somewhat useful. The perfect information point was well-debated during the spider change, and it was felt that JtRH spiders, even though it's not perfect information, aren't far off as they'll reveal themselves whenever they move or turn, and you're bound to see them as you play the room. Moreover, there's no real way to make the monster comply with the perfect information ideal completely without making it redundant, so the next best thing is to make it a case of keeping tabs on it as it moves around.
____________________________
What do you call an elephant at the North Pole?
Click here to view the secret text
×Lost.