Sensorium and the Euler Universe

We treat the living body as a multi-band instrument that samples the universe at many depths of time at once. The governing fact is elementary and inescapable: a signal travels at finite speed, so what a sense delivers is always the state of the world at a retarded moment. We define each modality's lookback time τ = d/v_sig and its lookback phase Δθ = ωτ, tabulate the ranges across the human senses, and show they span roughly twenty orders of magnitude — from the ~5 ms neural floor to the ~4×10^17 s age of the cosmic light horizon. We then push past the classical five in two directions. Inward: to the single-photon quantum event at the floor of vision, and to a candidate sense — magnetoreception — that may run on genuinely entangled electron spins. Outward: to non-electromagnetic carriers, neutrinos and gravitational waves, that pierce the wall of light and let instruments observe almost to the origin of time. A closing corollary turns the lookback principle on the oldest question: because no two separated observers ever share a present, solitude in the present moment is structural, independent of how populated the universe is. For perception the Euler phasor is offered as an intuition pump — it reorganises the facts but imports its physics wholesale, with one deliberate exception: a falsifiable prediction about how the present is bound. For cosmology the same phasor is no longer a lens on a dead model. The pure-circle universe that once failed has been replaced by the Single Breath — an elliptic rotation of a conserved modulus, carried on a genuinely expanding and later recollapsing spacetime, with the arrow of time supplied not by any growing radius but by entropy, the residual spent from a low-entropy dawn to a crunch that cannot close. This paper reads perception, solitude, and life against that live model, and returns to where the inquiry began: what the same arc of time implies about life itself — not something added to time, but a shape time can take, matter that holds a present while the past pours through it.