There are many possible causes for such sounds, he said, including large waves, earthquakes, shifting sands in dunes or deserts, far off thunder or man-made sources like factories, explosions or sonic booms.

WSJ: Clintonville, Wis. Becomes a Real Boom Town

Individual income taxes as well as corporate taxes are now far more rooted in the shifting sands of volatile business income and capital profits rather than in the terra firma of wage income that stabilizes payroll taxes.

WSJ: Michael Solon: The Revenue Deficit From Progressive Tax Rates

If this kind of concern for security was essential in Europe, it is of critical importance in the shifting sands of the Middle East, and particularly when dealing with Syria.

CENTERFORSECURITYPOLICY: Sharon Says 'No' to the Golan's Surrender

Demand for cartoons is like the shifting sands of a dessert, and it is hard to stay ahead of the pack in guessing where the next hot spot will be.

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