The idea that the use of hallucinogens should be a source of inspiration for some forms of prehistoric rock art is not a new one. This article intends to focus its attention on a group of rock paintings in the Sahara Desert, the works of pre-neolithic Early Gatherers, in which mushrooms effigies are represented repeatedly
The term "crumble and case" is just that -crumbling the substrate into smaller, more manageable pieces, and casing the pieces by laying a casing layer over the crumbled substrate.
