If we assume that the barrel was filled with something to begin with, filling it with air will make it lighter.
result - a hole
I don't have a predecessor
You've seen nothing like me before
If not for creativity
There wouldn't be a place for me
Thankfully, the world we live in
Will never stop discoverin'
Otherwise, I would not exist
And monotony would persist
What am I?
A criminal has to carry a sack of stones from one side of the prison to another.
What can he put in the sack that will make it lighter?
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