the.com/boundless

the only fence that holds nothing and keeps everything pouring through anyway

means Having no limits, edges, or end — vast or unrestrained in extent or degree.

from A marriage of two plain English pieces: 'bound,' meaning a limit or border, plus the suffix '-less,' meaning 'without.' 'Bound' here traces back through Old French 'bonde' to Medieval Latin 'bodina,' a boundary marker — and is unrelated to the 'bound' that means tied up (that one comes from 'bind'). So 'boundless' is, almost cheekily, 'without-a-border-stone' — a field with no edge.

origin
From Old French bonde, an edge it then refuses
physics
The universe may be finite yet have no edge
grammar
A negation that describes by what it lacks
math
Bounded sets can still hold infinite points
for instance

the ocean — covers 71% of earth's surface with no fixed boundaries

the universe — estimated 93 billion light-years across with unknown limits

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