Block universe theory
The physics that makes worldline identity possible: past, present, and future as a single four-dimensional block.
Worldline Identity Theory & Cosmological Recurrence
by Roan Sine
You are not a moment.
You are the whole four-dimensional shape of a life.
A person is not a soul, a persisting substance, or a momentary conscious state. A person is a complete conscious worldline — the entire structure of a conscious life, considered as a single object in spacetime.
A shape you cannot see at once
What a three-dimensional shadow is to a four-dimensional figure, a present moment is to a life. Drag to turn the figure in ordinary space, hold shift to turn it through w, and switch on Cross-section — top right of the frame — to pick out a single three-dimensional slice. The slice changes. The figure does not.
drag · rotate in space — shift + drag · rotate through w
Figure
The 4-cube. Its three-dimensional cross-sections are ordinary cubes — no single cube is the tesseract.
Rotation planes
Slide a three-dimensional slice through the figure. The slice is real — but it is never the object.
Six planes
In three dimensions there are three planes of rotation. In four there are six: xy, xz, yz — and xw, yw, zw. The last three rotate the figure through the dimension you cannot point at.
Why it warps
Nothing is bending. You are watching a perspective shadow of a rigid object, cast from four dimensions down to two. The distortion is the price of the projection.
The slice
Turn on the cross-section and a single three-dimensional slice is picked out in blue. It is entirely real. It changes as you drag. The figure does not.
Four claims
Time is a dimension
Past, present, and future coexist as parts of one four-dimensional spacetime. Nothing comes into or goes out of existence.
A moment is not a person
A brain state, a psychological snapshot, a moment of consciousness — each is real, and none of them is you.
The self is the structure
A person is the complete conscious worldline: birth to death, taken at once, as a single spacetime object.
No further fact
No soul, no Cartesian ego, no hidden bearer standing behind experience. There is only the ordered structure itself.
“The self is not something that moves through time. The self is the worldline itself.”