Wunderblock is a reflection on telepresence and the ambivalence that is carried through the presence-absence, virtual-embodiement, simultaneity-latency oppositions.  Wunderblock mediates the touch by relying on a state of tension between organic traces embedded in the material of a tactile sensor and digital traces reincarnated in the flesh of the virtual world. As it breaks the simultaneity traditionally at work in real-time human-machine interfaces, Wunderblock opens up the power of the après-coup. From traces on the walls of Lascaux to the prophylaxis of the Metaverse, this installation thus investigates the multiplicity of modes of collective presence and the variety of forms of memories that materialize there. The installation is made of a multiplexed matrix of pressure sensors and led strips embedded in several silicone layers and a web application that is deployed temporarily to the audience.