Answer:
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
Autumn leaves and bad bowlers wreak havoc on this
Up on high I wave away but not a word can I say.
I am so simple that I can only point. Yet I guide men all over the world.
What goes in, but never through? I've got some and so do you. We might lend one, or even two, but only if our trust is true.
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