hi, triciadrich - well, if you study buddhism, you will learn that life is filled with delusions. one of the goals of buddhism is not to let these delusions run your life.

i believe it is possible for people to have similar hallucinations. after all, there are very few original ideas out there. i am not sure there is meaning in inhallucinations and it's probably very painful if one believes in them and they are not true. it's the same as living a delusion. is the world a collective hallucination? well, if you believe in things like real estate bubbles and dot com bubbles . . . maybe . . . until they crash, that is. while the thought of collective hallucinations may be interesting, will it lead to anything concrete in your life? if the answer is no, then I suggest you move on and build a life and belief system on things that are more concrete. all the best to you!