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"I’ve worked with spiders for years and every spider that makes these aerial webs does it the same way; they anchor some web to an object, produce an extra long strand trailing behind them as they climb up and around obstacles, and then put tension on the line once they’re back up to the top. In this case the spider was expecting the rock to be attached to the ground, but since it wasn’t, the act of tensioning the line lifted it off the ground."