The Senome and Sentience: Exploring the Cellular Cave

The concept of a cellular "cave," advanced by Miller, Slijepčević, and Baluška (2026), has recently been interpreted to suggest that cells cannot know anything about their external environment. We argued otherwise, maintaining that cellular organisms cannot attain absolute or observer-independent knowledge of external reality while retaining the capacity to construct practical and functionally accurate representations of their circumstances. To support this stance, we now propose the novel concept of the read-write senome as the explicit informational architecture through which cells continuously sense, interpret, and respond to environmental and internal conditions. Central to this perspective, we argue that the plasma membrane, with its selective, dynamic, and mutable properties, can be understood metaphorically as a biological Maxwellian "demon," discriminating what information and matter cross the cellular boundary. The resulting senomic read-write process continually reconstructs the cell's functional representation of its environment while simultaneously modifying the apparatus through which it acquires subsequent information. Cellular closure is not an informational barrier to the world, but a fully reciprocating interface between cells and their external circumstances, ensuring the conditions that make situated, embodied, adaptive, but inherently limited biological knowledge possible.