Okay..some rambling...if I am allowed...
If we consider the Lagna as the true (?) self then arudha becomes what the self is perceived by others ( again takes into consideration the state of mind of the percivers) and what the self wants to showcase himself as to others.
If we remove the others out for some sanity and reasoning...
If Lagna is weak then the native would like to project different a self to others.It would become his need or want for growth in areas where self lacks. ( self moving towards AL).Then the self actually isint permanent.
Now if the self is strong there could not be any need of projecting a different image...or projecting a certain image wrt to a situation given.
So I guess nothing is real

or it is as real as we want it to be....