I agree on the preception of things are only relative to the person experiencing it. I often wonder "how real is everything and everyone" which sounds like a scary question to ponder, but aren't the characters in a good book real to the reader - if only for the time of the read? Does the "Thought process" cause creation or simply observe it?
If you haven't read my Out of Body experience essay www.beemaster.com/obe.html
I'd suggest it as an eye opener to what reality actually is. In a nutshell, I believe the conscience part of us (some people call it the spirit, I prefer conscience to help keep the conversation away from theology) but I believe we are phyically connected to the body and we have the ability (however induced) to detach ourselves and travel outside of the body.
When you can believe this to be the truth, and if you have experienced it yourself - you learn to see life a bit differently, more humbling at least and hopefully you can grow from the experience.
So, thinking something and more importantly SAYING SOMETHING ALOUD creates a REAL STATE for something to exist. So, next time you want something, SAY IT, don't just think it, and it should not only come about, but actually STAY there when you go back for it later!!!!