Multiscale collaborative virtual environments (MCVEs) are interesting for many application domains as they allow multiple users to interact with virtual worlds and themselves at different scales. However, natural interaction in such environments is often quite difficult, since the natural relations between humans and the environment in terms of body size, capabilities, affordances, personal space and interpersonal space are changed. In this poster we describe this penomenon and present an experimental setup with multiscale avatars in a shared virtual world that supports full-body awareness. We indicate first impressions of the perception of one’s size relative to the scale of the environment and the scale of others.