I am in anephase's shrine and I cant get the light on the reflecting off the oblisk to change directions so I can get it to the alter. How do I change its direction?

you have to drag those small obelisks (about waist hight) onto the square symbols on the floor leading from the light to the alter room. this stumped me too as the ornamental obelisks don't show up with spirit eye (although the stupid urns do, and they don't do anything)