What causes obsessions - for work, for love, for perfection, and many other cases?
Is it Mercury with its fast motions, going direct and retrograde, seeing the past, present and future, but unable to separate them?
But Mercury is the planet of communication, only the information gatherer. So does it then fall on to Mars, as the general, to be able to sift through the information and figure out which piece belongs where? And would his weakness towards the Moon, the emotions, cause him to make the wrong decisions?
I think obsession should be indicated with ketu conjunct planets as people will be too attached with those.
@amit You might be right, especially when I think about my Ketu conjunct things. I think there is more to it, but I will have to wait until I get back to studies next year to dig deeper.
Rahu conjunct my sun seems to have an obsessive quality for me.