Significant Sources 1: Flexipop by David Tibet lashtal December 12, 2015 December 13, 2015 No Comments on Significant Sources 1: Flexipop by David Tibet In a new feature, LAShTAL is pleased to present the first of a series of documents of significance to the history of the legacy of Aleister Crowley. First up? Flexipop! issue number 666 (honest!) and its famous article by David Tibet.