[If] there is a skylight in [the roof of] a house, and a pot is placed beneath [the sky-light] so that if [the pot] were raised its edges would not touch the [roof surrounding the] skylight, and there is tumah below, inside, or above [the pot], the tumah pene-trates upward and downward. [If the pot] is one handbreadth above the ground and there is tumah below it or inside the house, [the area] below [the pot] and [the] inside [of] the house be-come tamei, but whatever is inside or above [the pot] remains tahor. [If the tumah] is inside or above [the pot], everything becomes tamei.