Sixty orders of magnitude, one continuous tunnel.
You start at human scale. Scroll in for the quantum world, out for the universe. Pinch on touch. Scale and stratum mirror your position live.
A single WebGL shader renders the active scale layers each frame. Every one is a hand-coded procedural form, never imagery. Two strata cross-fade continuously; the gap between 'atom' and 'proton' is a factor of 100,000 — you feel it as a long passage.
Planck length 1.616 × 10⁻³⁵ m (CODATA 2018). Proton radius 0.84 fm (muonic hydrogen + electron scattering, 2019). Bohr radius 5.3 × 10⁻¹¹ m. AU exactly 149,597,870,700 m (IAU 2012). Lunar distance 384,400 km mean. Observable universe 8.8 × 10²⁶ m diameter (Planck 2018 + ΛCDM). Quarks and electrons are treated as point-like — the shown value is an experimental upper bound.