Bodhipaksa is working on a book developed out of reflections on the 6 Element practice, and he's allowed me to read 4 of the chapters so far. It's an amazing book, I can't wait till it comes out.
In the 6 Element Practice you contemplate how the elements of earth, water, air, fire (energy), space and consciousness are inside of us, outside of us, then you say, "they are not me, they are not mine."
It leads to a kind of spiritual death, and in the FWBO/TBMSG it is used as a run up to ordination, when you get a sadhana practice, a visualization of an archetypal Buddha, who has qualities you move towards, you become. I have not been asked to join the order, but I think about what sadhana I want to do when (hopefully) I'm asked to join. I have a connection with Avalokita, and others, and more recently with Amoghasiddhi.
But that's in the system of meditation designed by Sangharakshita for the F\WBO. I think you can just do this meditation. I've spent time doing it after liking it on one retreat. I've had some profound experiences, and been brought up to the great fear.
So Bodhipaksa has gained some insights from the meditation and he's done some back ground research into various aspects, and it's really quite interesting. I find it quite amazing. I can't wait till it comes out. It's the kind of book that you read on a solitary retreat, it's that awesome.