I'm sorry if this is in the wrong topic and if this has been answered else where but I could not find it.  I was wondering how Greater Glamours work.  Is it it used like evocations or like thaumaturgy?  If you could supply examples I would greatly appreciate it.  In the book it supplies mechanical differences but gives no examples.  Any information would be greatly helpful.  Also how long do they last and does it change the shift?