< Apricitous Temperature Check
I can actually still see the bookstore environs surrounding my first looking at the cover... all the way back to... <wait for it> ... <drum roll> ... 19.... EIGHTY.... SIX....
Headlessly, of course. :-)
It definitely felt a great conceptual basis for other reading material taking discussion/analysis of mind/self/conceptuality/modeling/"reality"/etc. to even greater/more-interesting depths.
I first read it perhaps 10-12 years ago and felt an internal shift with the experience of headlessness after doing some of the experiments. There were a couple of nights/days where I definitely felt myself to be in an altered state without benefit of unusual substances :)