Thrill-seeking is a passionate form of deep play, at one far end of the spectrum. Many people stop short of nerve-frazzling jolts and constant peril, but still seek the strange, the exotic, the intense. As they fine-tune the imagination for real out-of-the-body travel, they leave the trappings of self behind and pitch an outpost in a wild and mysterious country.
— Diane Ackerman, Deep Play