The Temple of Time was made in such a way that it can easily be displayed without slowdown even though it is a very large area and made of many polygons. You can see what the programmers did to achieve this. Go in the hallway between the main room and the pedestal. Slowly walk towards the pedestal and when you get to about the black strip in the hall, look at the walls inside the Master Sword room. If angled correctly you can see walls where they aren't supposed to be and no ceiling. You can do this the opposite way and if angled correctly you can see no walls in the main room. This was done to cut down on polygons so that the temple could be easily displayed. Neat huh?