Why in the hell are you asking such an ignorant question Trist?
Are you just trying to get my dander up? You're poking the bear and you know better.
The books in question are FOUNDATION material and even though they seem "dated" the material if vital to know. I've seen numerous "new" bits on the market in the past year alone based on what you find in those two books but yet, we have a myriad of people that own those books that don't recognize what's being sold and thus, they pay $40+ on something they already have. If that's not stupidity I don't know what is.
I have students that have taken routines straight out of Corinda, performed them at their magic club meetings and blown everyone out of the water who would then argue that
"it's not in Corinda, I read that book..." etc. But that's the problem... they "read" through the book but didn't STUDY it. That is why in my essay about becoming a Mentalist I suggest people study and work with Corinda in the manner it was originally released; taking each step as a one-three month course of focus, practicing/experimenting and getting to actually know that material by getting intimate with it. This is how you become adept at anything you seek to study in life, the speed reading and cursory looks only give you superficial perspective which is not sufficient if you're to excel.
UNDERSTAND, this are "Foundation" tools, not the gospel as much as Mentalism 101... a starting point! From what you find in these books alone, you can build a career (many have) but you do need to augment some of what you find, not only bringing techniques, etc. up-to-date but to better round out those areas that interest you most and attract you as an area of personal focus...you specialty as it were. The other side of this "next step" is simple to expand on other key foundation skills i.e.
Memory Skills
Billet Skills
Cold/People Reading Skills
Muscle Reading/Ideomotor Skills
Psychological/Linguistic Skills
From this point the sky really does become your limit and the rest of your study efforts center on those things you wish to use as tools to better define the who & what you are as a performer. That is where a lot of the Bob Cassidy material comes into play as well as a good chunk of the John Riggs and Banachek philosophies come into play.
You will notice that I'm leaving out PK type bits that some tie to Mentalism. The reason is quite simple, TOO MANY MAGICIANS ARE DOING IT e.g. it becomes more difficult to "sell" as a psychic styled performer in that it has become little more than a parlor trick in the minds of laymen that have seen it before... kind of like the Linking Rings or a Zombie routine. I'm not saying that you can't use it, only that it has been made a bit more difficult to "fit" into the idea of actual paranormal phenomena. Some folks have a knack in knowing how to get around this but even I have cut back (nearly cut out) this kind of presentation because it's been so overdone... but then that's a lesson we can all learn from Copperfield... if it's of current vogue, stay away from it!
