Warding - a request, Oh the irony Options

Yes, it's somewhat amusing that I'm asking for help - but does anyone know how to set up anti-spirit wards?

I have a twofold problem. Firstly, I have a whole load of "othersiders" who are attempting to get my attention (for some indecypherable reason), and I'd rather like them not to enter my room, and secondly, I need to be able to set up wards without arousing the suspicion of my parents.

So, here's my request:
Does anyone know how to set up strong physical wards, without them being too obvious? They'd need to be broad enough to block out everything of a non-physical origin.

This is going to sound way too simple, but it is amazing how well it works. Put salt (can be good old table salt) in water, and sprinkle it around the area that you do not want to be disturbed in. Works wonders! I had one student who had a ghost in their house strong enough to push people down the stairs, and that method (and a couple of other things) got rid of it, also another student of mine had been plauged by a demon their whole life, and the salt worked amazingly well to get it to stay out of certain areas! I use it whenever my dreams get downright wierd lol.
Salt works with etheric entities, however with astral entities, amulets, LBRPs etc. work very well (IMG:style_emoticons/default/smile.gif)
Athena