One of the aspects of the relationship between rock art and shamanism, which has been supposed to be of a universal nature, inspired by trance experience, concerns the intentional integration of the images with rock. Rock surface therefore has been interpreted, in numerous shamanic rock-art contexts, as a veil beyond which the otherworld could be encountered. Such an idea was originally proposed in southern Africa, then within Upper Palaeolithic cave art and also other rock-art traditions in diverse parts of the world. This paper for the first time discusses the relevance of this observation from the perspective of unquestionable shamanic culture in Siberia. It shows that the idea of the otherworld to be found on the other side of the rock actually is a widespread motif of shamanic beliefs in Siberia, and that variants of this belief provide a new mode of insight into understanding the semantics of Siberian rock art. Siberian data therefore support previous hypotheses of the shamanic nature of associating rock images with rock surface.