ONLINE COVER Special Issue on Human-Robot Interaction. Prosthetic systems that provide a strong sense of agency and ownership between the user and the prosthesis will improve performance and reduce the rate of device abandonment. Marasco et al. have developed a neural-machine interface for a bionic prosthetic arm that leverages the sense of touch to enhance physical ownership and provides grip kinesthesia to enhance agency. This month's cover is a photograph of the inside socket of a bionic prosthetic arm (see also Focus by Ortiz-Catalan).