0th dimension: a point.
It has no length, width, or breadth.
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1st dimension: a line segment.
It has a length.
It is created from moving a point.
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2nd dimension: a square.
It has length and width.
It is created from moving the line segment
in a direction perpendicular to the line on
which the segment lies.
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3rd dimension: a cube.
It has length, width, and depth.
It is created from moving the square in
a direction perpendicular to the plane.
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