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I build up castles and tear down mountains
I blind some men and help others to see.
I may be quick, though many box me in.

What am I?

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The answer is

Sand

I build up castles and tear down mountains

Sand is used to build sand castles and sand can erode mountains

I blind some men and help others to see

Sand storms can blind people and sand is used to make glass for eye glasses

I may be quick, tho many box me in.

Quick sand, sand box

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I build up castles and tear down mountains

Stone is used in building castles and also tear mountains.

I blind some men and help others to see.

Stone dust most harmful to eyes and stone such as tiger stone release fear,anxiety, stimulates taking actions and helps to make decisions with understanding. So in a way helping clear vision.

I may be quick, though many box me in.

Rolling stones are fast but they are kept in box in household for decoration.

What am I?

Stone.

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