Control a single-photon interferometer directly. Watch superposition, interference, and complementarity show up as things you can turn on and off — not as things you're told to believe.
Scene
Apparatus
path A (phase-shifted) path B which-path marker
Controls
Which-path detector
marks the path via entanglement — not a "bump"
Show the math
reveal amplitude expressions
P(D0) = cos²(φ/2)
P(D1) = sin²(φ/2)
V = (Pmax − Pmin) / (Pmax + Pmin)
which-path on → V → 0