Your explanation is confusing me even more!

Different example:
When I say, the passenger looks to the north - his view direction is described in world coordinates, right? Its, because his view direction is described _independently_ of any object's orientation. Its an absolute value.
When I say, the passenger looks out of the left window of the bus - his view direction is described relativ to the bus' orientation - means, it is relativ to the bus. To get the world coordinate I need the orientation of the bus, means it is a relative value.

(I'm curious, what's the mistake in my definition.)