An old but good one - there is a parable there somewhere - how we can achieve more when we work together in cooperation. This could easily be transformed into an anti-capitialst diatribe
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It always surprises me how few people know of it. I always find it works better with the subject lying down. Also interesting, is the idea of adding suggestion to this routine to make the experience more powerful.
Now, the interesting thing is - that this old chestnut falls into where (for me) magic is going. i.e. away from 'tricks' and towards genuine phenomena. We are all used to stripping down an old magical principle and rebuilding them, or using the basic principles as building blocks for new ideas- would it not be interesting to do the same with genuine phenomena?
First you would have to define what is meant by 'natural phenomena'.
then you would produce an exhaustive collection of everything from ideomotor responses to suggestion and hypnotism, all the weird old things you did as a kid (well.... I did!), such as staring at yourself in a mirror for 20 minutes, under the light of a single candle (to see you previous incarnation of course - hey, try it!)
Then you would have to strip them down to what
actually is working.
Then rebuild into new 'effects'......
Then you would have 'mentalism on steroids', something that would issue in the 'new paradigm of mentalism' and 'something you could start a religion with'.
Quick everyone, write an ebook and flog it in the green Vatican!
(I don't mean to sound cynical, as looking in this direction would be the most useful thing we could do - but I have the flu again, so it is my evil twin talking!)