The Double Slit — One Figure, Two Doors
The oldest riddle of quantum mechanics asks how one particle passes through two slits at once. T Theory refuses the premise: the figure never travels at all. Both doors are on the wheel, the whole turn is held in the now — and the wall shows only the shadow. An explainer you operate: fire the figures one at a time, watch the doors, drag the point, delay the choice.
Nothing here is invented. Young drew the fringes with light in 1801; Merli in 1974 and Tonomura in 1989 drew them with single electrons — seventy thousand of them, one at a time, never two in the apparatus, one fringe pattern. And the clock that explains them is the same clock the Unified Model reads as mass: de Broglie’s turn, ν = mc²/h. Between the source and any point on the wall there are two ways through, and each way counts its own turns. Where the counts arrive closed together, bright; where one arrives half a turn against the other, dark. The fringes are agreement, repeated down the wall.
The page separates its claims: established — Young’s fringes, single-electron interference, de Broglie’s clock, complementarity (any recorded which-path information destroys the fringes; looking is irrelevant, recording is everything), the performed delayed choice, decoherence; interpretation — the figure holds both doors on the wheel in one now, the record splits the shadow because it splits the closure, delayed choice needs no retrocausality because nothing went forward; open — where the shadow becomes a single dot, what exactly counts as a record, whether gravity ever forces the choice.