Sapiens Scientia · Structure of Time
The Ladder of Scale climbs through space; this is its twin in time. Reality is not only a nested hierarchy of systems — it is a sequence, each scale switched on at a moment in cosmic history. This is that history made navigable: a powers-of-ten arc from the Big Bang, through the origin of life and mind, to the human present.
Plotted on a logarithmic time axis with the Big Bang as year 0, the whole of recorded history is the thin bright tail of the arc: the last twelve thousand years of farming, writing, and science take up as much room as billions of years of cosmic and geological time. Deep time is compressed; the human present is stretched wide. Hover any moment to read it.
Tap an eon to focus it. Hover an event to read it.
The Knowledge Age13.8 Gyr since Big Bang
You are here. Computing and global networks bind humanity into a single information system — the present moment this project maps from.
Labels show elapsed time since the Big Bang. Rail positions use order-of-magnitude time on a base-10 log axis, not precise dates.
Each eon switches on a new layer of the system. The cosmos forges matter and a planet; the living Earth fills with cells and bodies; animals evolve minds; and a single species turns knowledge into a method. The same platforms that study the ladder of scale also have a place on the arc of time.
Eon I
Year 0 to 9.3 billion years
The origin scale of time. Matter, the elements, the first stars, and finally a planet condense out of an expanding universe. Everything later on the arc is assembled from atoms forged here.
First light
A world forms
Eon II
10.1 to 13.2 billion years
The biogenic scale. Life begins, learns to breathe sunlight, invents the complex cell, and finally assembles itself into many-celled bodies. Earth becomes a planet that its own life has remade.
Single cells
Bodies
Eon III
13.3 to 13.8 billion years
The animal scale. Nervous systems, skeletons, vertebrates, and warm-blooded mammals; mass extinctions clear the stage and the first upright apes step onto it. The lineage that becomes human takes shape here.
Animal life
Turning points
Eon IV
13.8 billion years to now
The human scale of time. A single species learns language, farms, writes, reasons systematically, industrializes, and connects itself into a planetary information system. The whole of recorded history is the thin bright tail of the arc.
Becoming human
Civilization
The Ladder of Scale and the Arc of Time are two readings of the same structure. A thing's place in the hierarchy of scale is also a moment in the history of the universe — a cell is both ten microns wide and 3.7 billion years deep. Sapiens Scientia studies the world along both axes at once.Climb the Ladder of Scale