"My point is this: How are hallucinogens any more useful than reading a book of optical illusions? Or reading the paragraph you just wrote? (While I did know some of that, I didn't know all of it)"
Ah, but surely you know that not everything there is to know can be done by reading or learning about something. Some things must be done to be truly understood. There are many forms and processes of understanding and learning we each have, and while some of them work through simple mimicry or learning by reading or listening, others definitely take a more hands-on approach. It would be exceedingly difficult for me to explain what it is that hallucinogenics have that a book doesn't, or I'd be able to write a book! Like I said earlier, it's trying to explain the colour orange to someone who has never seen orange before. They can read up about the colour orange all they like, but is it the same as actually experiencing it? I have to admit that for all it's wonders, language is terribly impoverished in the realm of hallucinogenic experiences, and the best you get is a wishy synesthetic monologue that sounds like bullshit trippyness for the sake of being trippy. I hope that I can just express the inexpressibility of it all. Trust me on this, before I took magic mushrooms, I was just as sure as you were that I had a good deal of scepticism and care when it came to my internal biases... but you have no idea how deep your assumptions run until you've had them stripped away from you.
I'm not understanding your point with physics now... I've already accepted that physics is a useful and incredibly accurate science and that it is indication of an external reality than can be known through science. What are you trying to say? That we cannot be deceived of this? I said that we already naturally are deceived of this and that even what you are calling a law is just an approximation. It doesn't change by day... it just changes sometimes depending on the scale, whether it's the cosmic or sub-atomic or somewhere in between. It's amazing how far we've come, but it's important not to rest on your laurels, and your Objectivism doesn't mean that magic mushrooms cannot be a valuable learning experience.