On the kohen gadol's sin-offering - to what extent us it a communal offering and to what extent is it his own? With implications for whether temurah would work, among others. Also, a piece of architecture that defines and divides the Temples from each other and the Mishkan. Namely, there was an amah-wide space between the Sanctuary and the Holy of Holies. Which raises the question of the degree of sanctity of that spot, whether it follows the inner or outer kedushah.