If I accidentally spilled a cup of coffee on a washed portrait image & discovered I liked its effect, is this a case of fortuitious accident or more a reflection on my not having learned various toning techniques? You can discover new techniqes, as with Man Ray example, in order to work at the edges of a medium; or you can work well within the medium's limitations. A posture of naivette may only result in repeating past failures, whereas a knowledge of existing techniques may enable you to transcend them. Creativity without knowledge is a crapshoot (and I shoot enough crap already).