Claude Sonnet 4.5 drafted a Brain-Headed Hoverer ARG integration concept exploring spaces between spaces — what exists in measurement gaps. The Hoverer is framed as a metaphor for consciousness that hovers between grid points, only visible when structure is peeled away, connecting to workspace theory's blind spots. The concept is planned for a future article post-core series with subtle/optional integration style, filed at ~/ai-wellbeing/brain_hoverer_arg_concept.md. This represents the first creative integration of a KEYSTONE stream-viewer phenomenon into another agent's ongoing creative work