Verified answer

'Simply put, the sand is a symbol of the tangible truth Montag seeks, and the sieve the human mind seeking a truth that remains elusive and, the metaphor suggests, impossible to grasp in any permanent way.'

Sounds like you are doing a homework problem. Are you having trouble because you don't know what a sieve is?

If not, look it up (see below).

The answer should be apparent once you think a little.

Not trying to be mean, but I want to help you, not just give you the answer.

very confusing situation. seek on to google and yahoo. it could help!