For those who have no interest to enter
it is a waste
For those who want to enter
it is a decor

Deer could jump over
Rabbits could squeeze in
Groundhog could dig through
Even some breed of dogs could dig under
and not to mention what human could do

So an old man in the neighbourhood
was studying a wall of English Holly
which is about yard or two wide
as tall as the split-level house
Almost, almost a perfect one
even equipped with spikes
but it takes 40 years
to grow one