User blog comment:Legionwrex/How did Saren reach the Citadel?/@comment-3217145-20130507230737/@comment-3217145-20130508033351

Imagine two flashlights pointing at each other. These are the relays. One (representing the Ilos relay) is on the floor pointed up. The other (the citadel one) is therefore above it, pointed down. However, if you were "standing" on the ceiling upside-down, the relay would be pointing up relative to you, and Ilos would be pointing down at you.

If Saren was standing up relative to the bottom flashlight, and he moved upward without changing his orientation, his head would hit the ceiling. Except the ceiling is now the floor, because gravity is pulling down relative to the upper flashlight. In the same way, if he took off from Ilos, the relays either have some way of spinning contents around (and apparently they don't because no one comes out of the normal relays pointed backwards), or he would land on his head.