Re: 5x08 The Hungry Earth (Grading/Discussion) SPOILERS!!
In the first Confidential Matt Smith holds up a plan of what the various TARDIS control systems are, the one which Rory placed the ring seems to be fabrication. What would be fabricated, if that is what the section is for, is an interesting question?
We are quicksilver, a fleeting shadow, a distant sound... our home has no boundaries beyond which we cannot pass. We live in music, in a flash of color... we live on the wind and in the sparkle of a star! Endora, Bewitched