Spacetime's fourth dimension.
To be sure it's a valid one,
Somethings I'll have to mention.
One dimension is one direction
Pointing straight one way;
Length, measures a length section
Every single day.
Another one will measure width;
We call it dimension two.
Distance units we measure with;
Millions or just a few.
Next one aims toward starlight;
This third completes space objects;
A vector measured for the height
Of all and sundry projects.
These three all describe the way
They take up room in space.
Notice folks, it's now time's turn
To tell about its place.
Proving to us, once for all,
It has dimension nature;
Informing you that motion stalls
Event facts intervention.
In the present moment
Is one non-motion event
The one that came before it,
A past non-motion lament.
The event we haven't come to, yet
Is just as still as stone
We call it future, linear pet;
Non-motion up-ahead zone.
This stack is a length we measure,
One direction to be sure;
The fourth, the time dimension
Making spacetime reality pure.
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